The Mad Scientist

Random Ravings of a

Retired Rocket Scientist

Meet the author, Woodrow Wilson

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Essays on science, engineering and medicine. A rocket scientist reflects on the world around us. A great read for young adults of all ages.

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September 18, 2019

Dolphins ruled the ocean for millions of years—waiting for aliens from dry land to catch up to them. Dolphins cared for their sick, worked and played together, communicated, used tools, and taught their young long before our ancestors climbed down out of the trees.

Their ocean mastery extended beyond their own species. Coordinated attacks kept predators at bay. Even Great White Sharks avoided them. Dolphins often took interest in other inhabitants and visitors to the deep. On-line videos show dolphins rescuing dogs that have fallen in and whales in trouble.

When the first primates stepped off shore, dolphins were there to welcome a second intelligent Earth species. They have protected human swimmers from the perils of the ocean—and from their own stupidity—ever since. Dolphins still drive fish into human nets for a share of the catch. They still frolic in the bow wake of human ships they could easily outrun.

The dolphin brain is probably second only to the human brain here on planet Earth. Vast differences between species and their environments limit rigorous ranking of intelligence between species. Relative brain weight is thought to be a good measure. The first duty of the brain is to operate the body. The fraction of the brain required to do that grows with the size of the animal. Only what's left over is available for thinking. Humans rank highest in this excess brain capacity. Killer whales—a large dolphin species—rank second.

Our fellow Earthlings are friendly and smart. They rule the two-thirds of our planet we have not explored. What might they have hidden there? My novel Fish Story tells of an advanced dolphin city beneath the Bermuda Triangle, and of captive humans kept in a zoo there.

September 11, 2019

Four billion years later, the solar system is still littered with bits and pieces left over from creation. Fragments ranging from sand grains to Studebakers burn up in our atmosphere every day. Bigger pieces hit Earth like atom bombs every century or so. The biggest impacts can be catastrophic.

Twenty years ago, Japanese astronomers discovered a half-mile wide object among the swarm of debris near Earth. Despite being huge and close, this body had gone undetected until now. It is virtually invisible because its surface is charcoal black and reflects barely 4% of incident sunlight. Careful study of this object, Ryugu, predicts it will not impact Earth in the foreseeable future. How many comparable hazards lurk undetected out there remains unknown.

The Japanese Space Agency sent a probe to learn more about this new class of Near-Earth Objects. Hayabusa2 is in orbit around Ryugu. Photos from there show it is a jumble of black rocks. The mission has landed four probes on the surface. They find two types of boulders resembling the oldest know meteorites. Both types are believed to have formed early in the creation of the solar system. The different pieces have clustered together over the four billion years since. A weak mutual attraction holds them together. Ryugu has an average density closer to ice than to stone, so its rocks must be loosely packed. There's enough gravity to keep the cluster from drifting apart, but not enough to crush it into a dense sphere.

Next, Hayabusa2 will attempt to return samples to Earth. The probe has already approached close to the surface to collect samples. It fired a bullet point blank into it and opened a sampling port to grab a bit of the backsplash. Scientists won't know if or how much rock was collected until the probe's return in December 2020.

September 4, 2019

Those who will not vaccinate endanger those who cannot vaccinate—the very young, the very old, and the very sick. Diseases that shouldn't even exist are rampant among the unvaccinated. The World Health Organization (WHO) is alarmed about the current European measles epidemic. The rate was high last year, but doubled to ninety thousand cases in early 2019.

Measles is a virulent disease easily controlled by vaccination. The measles virus spreads efficiently from one person to another. Germs that fail to find an unvaccinated host die. Containing the spread of disease requires most of the population be immunized. Sickness spreads through populations with inadequate immunity.

Containing measles requires an estimated 93+% vaccination rate. The current US rate is only 90%, so we are in danger of measles epidemics. Last year, visitors from Mexico and Israel imported measles that spread through unvaccinated enclaves across the country. An unvaccinated baby brought measles to San Diego from the Philippines three weeks ago. It is spreading. County health officials are working to contain it. The unvaccinated among us are the express route to epidemic—mostly due to the mistaken notion that vaccination causes autism. That blatant lie was debunked years ago, but continues to spread through a naïve population.

Preventive medicine is rare among those who can't afford it. Poor migrants from third-world countries bring little immunity with them. Those who have had a disease are often protected from reinfection. Those who haven't aren't. Many of the victims of the European measles epidemic are among their immigrant population.

Measles isn't the only disease uncontrolled despite an effective vaccine. On the US border, mumps are spreading through the Central Americans concentrated there. Hundreds of migrants—and a few unvaccinated government workers—have contracted the disease. Victims are quarantined to limit the spread of the disease. It has not reached the general population—yet. The Centers for Disease Control (CDC) are monitoring the situation. Vaccinate you and yours to opt out of the coming epidemic.

August 28, 2019

Krakatoa erupted with the force of ten thousand atom bombs on August 27, 1883. It made the loudest noise in history. Eardrums burst for forty miles around. The sound was heard three thousand miles away. Its explosive shock circled the globe three and a half times. A tsunami with waves up to a hundred feet high killed thirty-six thousand people throughout the South Pacific. Red-hot pumice and ash rained down fifteen miles away.

The volcanic plume lofted cubic miles of dirt and debris into the stratosphere. Once it was up there, the winds spread it across the globe. Worldwide weather was upset for five years afterwards. Temperatures dropped a degree or so the first year. California recorded record rainfalls. Bright red sunsets were misinterpreted as forest fires. Fire departments were scrambled for false alarms half a world away.

Krakatoa was the second biggest volcano in recent history. The eruption of nearby Mount Tambora in 1815 may have been up to ten times as energetic. Its immediate effects killed at least twice as many people as Krakatoa. Its environmental consequences were even more pronounced. The resulting "Year without a Summer" lead to widespread famine, and historic human migrations. Historians say Extreme rain contributed to Napoleon's loss at Waterloo.

Volcanoes as destructive as Krakatoa and Mount Tambora erupt sporadically along the Pacific Ring of Fire. It's been almost thirty years since the last one; the next one could come tomorrow or in a hundred years from tomorrow. The next one could be bigger … up to a hundred times bigger. There are twenty super volcanoes—including one beneath Yellowstone National Park—The New York Times says could "end human life on Earth." The eruption would be like no event in human history. Earthquakes would precede the explosion. Then it would spew a lava lake eighty miles wide. Htree feet of ash and debris would bury surrounding states. The lofted plume would blacken the sky. The New York Times projects that temperatures would plummet, crops would fail, and the infrastructure would be devastated. A once-in-a-million-years ultra-catastrophe event comparable to the one that wiped out the dinosaurs could result.

August 21, 2019

A quarter of all of Earth's CO₂ ends up in Earth's oceans. CO₂ doesn't dissolve in air or in water; it just mingles with them. CO₂ molecules are neither attracted to nor repelled by water. They simply meander in, and occupy holes in liquid water. The molecules inside wander through the liquid lattice—some drifting deeper in, and others straying back out. The balance between those entering and those leaving determines the net amount contained. Increasing pressure of CO₂ in the air above drives more CO₂ into the water. Decreasing it reverses the process. Uncap a soda or pop a champagne cork and watch the excess bubble out.

This is not just for CO₂. It's true for most of the constituents of air. N₂, O₂, and CO₂ all behave the same way. Water has no affinity for any of them, so they all just mix with water. Warm the liquid: its holes collapse and the pressure for aliens to leave increases. The gases of life are plentiful in cold water. Abundant CO₂ supports simple plant life that is the foundation of the local food chain. Plentiful food and ample O₂ support the population. Life grows big in polar waters. Whales, polar bears, and king crabs thrive at the top of that food pyramid. Things are less rosy elsewhere. Tropical seas are warming. Fish suffocate and coral reefs are bleached.

Increasing levels of CO₂ are beginning to alter the chemistry of the oceans in important ways. A little of the dissolved CO₂ reacts with the water to form carbonic acid H₂CO₃—the stuff that gives carbonated beverages their taste. H₂CO₃ is a weak acid because a bit of it combines with water to create a hydrated proton H₃O⁺ and a bicarbonate ion HCO₃^-. Sea life evolved in a slightly basic environment; some of it may not adapt well to becoming even slightly less basic. Shellfish could be among the first affected. The stuff their shells are made out of dissolves in acids. The populations of their natural predators would suffer if they were diminished. The effect would propagate throughout the food chain.

August 14, 2019

Robots get to go to the most fascinating places. Robots troll our oceans and drive our highways today. They're roaming the moon and colonizing Mars. NASA has announced the best trip yet: Titan. NASA plans to launch its Dragonfly mission to Titan in 2026.

Titan may be a scale model of the early Earth. It's the only other place with rivers and lakes and seas today. Radar data from the Cassini mission show mountains and valleys and volcanoes dotting its surface. Erosion by wind and rain reshapes its geology. It's a picture postcard of what Earth might have been before there was life here. A mission to Titan could be time travel back four billion years. Viewing what might have been on an Earth clone will help us better understand our planet.

This ersatz Earth is a cold dark place. At two hundred and ninety degrees below zero (-290°F), water is frozen into an exotic solid known as Ice XI. Titan's lakes, rivers and seas are filled with liquid natural gas. When it rains, it rains methane. Volcanoes spew a mixture of water and ammonia. Images from the Huygens lander show "volcanic rocks" there are ice. Titan is a moon of Saturn. Sunlight there is only 1% as bright as it is here. Titan has a deep smoggy atmosphere with clouds. Only a small fraction of that light reaches the ground. Daytime on Titan is like a foggy moonlit night on Earth.

Dragonfly will be a nuclear-powered drone equipped to survey Titan's lands and seas. It will able to land, take samples, and analyze them. Dragonfly instruments will include advanced life detection systems. Life in a methane world may be possible.

Communications to or from Earth will take seventy to ninety minutes each way. They will be blocked out when one or both bodies are eclipsed. Remote operation will be impossible with such delays. Dragonfly will have to function autonomously with only rough mission assignments from home. It will survey an area and return to focus on features as directed by NASA scientists.

August 7, 2019

The deep ocean is an alien place where people can't survive. There, robots work better, faster, and often cheaper than humans. The farther down, the greater the advantage. Divers have to carry their natural environment with them: heat, light, air and water. Robots can be engineered for the challenges. Cold needn't be problem. Sonar vision works just fine. Machines can go on working as long as their batteries last. When one is lost, no wrongful death lawsuits or negligent homicide prosecutions result.

Robot submarines and remote-controlled vehicles are performing complex tasks beneath the ocean. State-of-the-art robot submarines were on display last week. Commercial devices maintain offshore oil wells at forbidding depths. Research submarines study the ocean to depths where people seldom trespass. Smart submarines patrol the Strait of Hormuz. They spotlight hazards to navigation for Navy intervention.

The designers of tomorrow's robot subs met in San Diego for the Autonomous Underwater Vehicle Competition—Robosub. Students representing fifty-four leading schools from thirteen countries fielded robot submarines to compete. Their entries were industrial machines bearing little resemblance to traditional submarines and none to R2D2 or C3PO. Instead, each was engineered to complete a series of tasks simulating actual underwater work. The robots had to navigate between buoys, recognize objects by shape or by color, retrieve objects, retrieve or deliver things, open doors, and more – all with no human intervention.

These machines were true robots – trained to do tasks, then turned loose to do them. Their tests were scattered throughout the Naval Information Warfare Command Pacific's transdec pool. The robots decided which tasks to perform and when to do them on the fly. Their onboard computers were programmed to understand the scoring for each task: there were points for how well they performed and points for how fast. They recalculated how to make the most points at every turn.

The ocean is an environment more alien than the moon or mars. Robots on those remote bodies function in little or no atmosphere and under reduced gravity. Those conditions are a lot like those in a terrestrial desert. Underwater robotics face challenges all their own. Robot submarines operate in an atmosphere a thousand times as dense as Earth's surface. Buoyancy competes with gravity, and things sometimes fall up. Robot submarines don't always behave the way intuition suggests.

The student engineers competing at Robosub spent the past year taming their robots to do their work better and faster there. This year's competition displayed a line up of agile robots that accomplished their several tasks gracefully despite their clunky industrial appearance. First place in the competition went to Harbin Engineering University from China. Far Eastern Federal University from Vladivostok, Russia finished second, and Arizona State University came in third. All fifty-four teams can be proud of their robots. Most have just started work on their new and improved entries for 2020.

July 31, 2019

Coral are seeking asylum in cooler waters. As equatorial seas warm, equatorial coral die off. Their offspring are migrating to new frontiers in cooler waters.

Coral are small animals that wrap themselves in limestone sheaths. Vast colonies pile atop their ancestors' remains to form undersea mounds spanning hundreds of miles. Coral exist there in a symbiotic relationship with local flora and fauna. Their reefs are local ecosystems hosting a quarter of all ocean life. Brilliantly colored plants and animals give the reefs their famous vivid colors.

When water temperature rises, the solubility of the essential gases CO₂ and O₂ falls. As those gases disappear, life on the coral reef dies off. Plants can't photosynthesize without CO_2. They are the base of the food chain. There's nothing to eat, and no O₂ to breath. Nothing remains but limestone shells and their starving occupants. The naked coral limestone remains are white, so the coral reef appears to have been "bleached."

The adults are trapped, but their young are free to swim away. Offspring are created in a community event synchronized with the phases of the moon. Simultaneously all across the reef, adult coral eject eggs and sperm into the surrounding water. Fertilization there creates free-swimming zygotes. They travel until they find a spot to light. Then they settle down and begin building their limestone sheaths. Most remain nearby and add to the existing reef. The few that venture beyond create remote reefs. As the oceans warm, the travelers find themselves well situated to initiate future reefs. Nature Is adapting to changing ocean conditions.

July 24, 2019

A solar flare in our direction could set the world back to 1950. Its intense radiation would hit us like a nuclear attack in space. Set nuclear bombs off out there, and fry the electronics in every satellite, and scramble half the stuff on the ground. Television, internet, and GPS would be gone. No soaps, no facebook, and no way home. It would be back to magazines, conversations and maps. Life as we know it would end until our electronic infrastructure was rebuilt.

It could happen someday. The sun is a turbulent place with flashes and flares spurting out all over. The study of the sun began with the invention of the telescope. Storms have come and gone with an eleven-year cycle ever since. Solar observatories monitor the sun today, and a NASA probe is on the way to explore its outer atmosphere. We still don't understand the sun well enough to predict the big one.

Tides drive weather on the sun. The sun is a ball of plasma—a fluid that flows like a liquid or a gas. The sun's plasma has tides much like Earth's oceans. Here on Earth, the moon's gravity tugs ocean water toward it, raising the sea level. Halfway around the planet, water flowing toward the moon drops local sea level. High and low tide trail the moon as the Earth rotates under it. The sun is a lot farther away, but a lot bigger, so its tidal effects are noticeable. When the sun and the moon line up, their tides add and the highest tide of the month occurs.

The planets drive the tides on the sun. The nearby planets Venus and Earth create tides like our moon does on Earth. Jupiter is far away, but gigantic. It adds a sizeable tide of its own. When two planets line up in a row, their tides add—like high tide on Earth. That rare event occurs when one planet overtakes the other. Earth and Jupiter work like the hands of a clock. Jupiter—the hour hand—goes around once in twelve hours. Earth—the minute hand—goes around once an hour. The minute hand passes the hour hand every hour and five and a half minutes. When the Earth lines up with Jupiter, every thirteen-plus months, the planets tides add together. It's the same with any pair of planets. An even bigger effect occurs when all three planets align. That happens once every eleven years. The maximal tides damp the surface storms. Thus the sun's eleven year cycle of weather.

July 17, 2019

Organ transplants race the clock. Your organs won't outlive you by much. They depend on the body's support systems, and start to fail once they're cut off. Critical organs must be sustained just to accommodate surgery for the living. Organ transplant is even more challenging. Organs are harvested, packed in ice, and sped to their new host. Tissues start dying in transit. Every second counts.

Technology to the rescue. Drones fly organs between hospitals faster than a speeding ambulance. Drones deliver farther and faster so organs arrive healthier. Transplant success increases. A lung perfusion machine from XVIVO Perfusion prolongs lung life in the operating room while recipient preparation proceeds.

Portable versions of operating room systems are extending the time constraints for organ transport. Systems maintaining normal temperatures and body fluid flows are being tested for human organs. A portable organ support system from TransMedics Inc was used in a recent liver transplant operation. That procedure succeeded despite distances that wouldn't have been tried with conventional transport. The company also has an experimental lung machine in advanced development. That system even maintains the organ's breathing function. They report progress toward a heart carrier as well. Their products are expected to double the time available for organ transport. An advance of that magnitude would expand the outreach of organ transplant programs. More organs would reach more recipients. Fewer people will die waiting for an organ.

Technology notwithstanding, there will always be a demand for organs. Leave what you can.

July 10, 2019

President Trump has announced a return to the moon, and skeptics ask Why? It's our first step back into space after a fifty-year hiatus barely off the ground. Living and working on the moon will teach us to be a space faring race.

The moon can serve as Mars-lite—the next step beyond Hawaii's Mona Loa volcano. All of three are barren and lifeless. Space suits are required just to step outside. The last HI-SEAS exercise ended with a medical rescue within hours of an accident. On the moon, help from home is three days away—a bit more forgiving than Mars nine-month distant. The moon and Mars are bathed in the solar wind. Both astronauts and their equipment must be hardened to survive radiation. The alien environments of the moon and Mars may pose surprises for men and machines. Don't leave home with them.

The moon can be a lot more than just a dry run for camping on Mars. Moon minerals resemble Earth's. Heavy low-tech items like engines and propellants could be manufactured there and launched into nearby space at a fraction of the energy cost. Only a few high tech items would have to come from Earth. With no atmosphere to worry about, the Mars mission could forgo streamlining.

An industrial outpost on the moon would develop into a settlement—just like every other human venture into a new world. It would follow the Dulles Airport experience. Sited way out in the middle of nowhere, a community sprung up around it. Industrial suppliers came first, and then alternatives for essential services followed. A growing population provided a market for nonessential services. Moon populations would grow. Local alternatives to import from Earth would spring up, and the colony would approach self-sufficiency.

Exports could support growth—but what? What have they got that Earth doesn't have? Cold and vacuum. Almost no known material is worth the cost of shipping to Earth. A few large-scale industrial processes require high vacuum. Pumping costs were the reason for citing uranium isotope separation in Tennessee. It provided access to TVA electricity. Hard vacuum is readily available all over the moon. Specialized highly processed materials may turn out to be economically feasible.

Astronomy loves a vacuum too—especially on the far side of the moon where Earth's radio emissions don't interfere with looking back toward the big bang.

There's a market for information because information is weightless. Lunar computers may have an edge there. Terrestrial data centers spend more energy on cooling than they do on computing. That's why they're migrating farther and farther north today to reduce cooling costs. Lunar data centers might prove worth the investment of moving there. Lunar temperatures may even open new horizons in computing. Superconductivity is the Holy Grail for electronics. Its zero electrical resistance would drastically reduce energy costs for computing. The search for room temperature superconductors continues. Meanwhile the moon's cryogenic temperatures may be low enough to accommodate these ideal electronic components.

The moon will open a new frontier, like no other. The possibilities are endless.

July 3, 2019

An explosion aboard Apollo 13 on its way to the moon captured the world's attention. The success of Apollo 11 had begun a campaign of lunar exploration. Samples returned by the Apollo missions revolutionized our understanding of the moon's formation and geology. The moon is not an alien rock, captured later. The Earth and the moon formed at the same time in the same place. Moon science and adventure continued until Congress cancelled funding for it. Robot probes have explored the solar system and beyond, but humans haven't ventured farther than low Earth orbit in the fifty years since Apollo.

I remember following the Apollo 13 progress over the radio in Toronto. (Still no television.) An oxygen tank had blown up on the way to the moon. All three astronauts survived, but mission critical systems were lost. The crew had to move from the crippled Command Module into the Lunar Lander for the duration. It was cold and cramped in there. The CO₂ scrubber wasn't working. Cabin air was bad and getting worse. Computer controls were lost. Essential engine burns were timed with the second hand of an astronaut's wristwatch. The vehicle was on an assured-return trajectory. The craft would make it back to Earth. Could its crew survive until then? Could they land their crippled craft? The world held its breath as Apollo 13 skated far out beyond the moon before lunar gravity flung it back toward Earth.

Back on Earth, NASA engineers raced to jerry rig patches to failing life support systems. Use anything aboard—and nothing you wish you'd sent. They did their damnest with no holds barred. Three astronaut lives depended on them. Thanks to NASA engineers' ingenuity and the astronauts' skills, the Apollo 13 astronauts returned to Earth safely.

The spirit of the Apollo 13 rescue was an inspiration for my Stranded on Mars novel where a hardware failure maroons NASA pioneers a hundred million miles from home with no Plan B.

June 26, 2019

An American dream came true fifty years ago. President Kennedy had challenged the nation to land a man on the moon and return him safely to Earth within the decade. On July 20, 1969, the world watched in awe as America dared to do just that.

Most Americans 55 and older remember where they were that day. I was in my in-laws' living room watching live coverage on their television. (I didn't own one then.) The tension was palpable. Could they reach the surface of the moon? Could they land safely? What was the moon made of? Would it support the lander? The uncertainties were endless. I paced through the entire descent until Neil Armstrong announced, "The Eagle has landed."

President Nixon phoned his congratulations to the astronauts. Man had reached the moon. It was the culmination of a Herculean effort. In a single decade, American engineering had gone from orbiting a man in a can to landing a crew on the moon. Most of this had all been done by hand. Computers were just coming along. World computing capacity of the day couldn't match a single modern cell phone. Computers were new, and not really trusted. Electronic computer calculations were checked by human computers before NASA risked using them.

Time dragged by. I paced the living room while the astronauts suited up to leave the lunar lander and step onto the moon. Walter Cronkite's news coverage alternated between the moon landing and the other big story of the day. On the eve of realizing John Kennedy's legacy, his brother Ted had gotten drunk, and driven off a bridge into a lagoon. Kennedy escaped the car, and swam to safety. He left his escort behind to drown.

Our eyes grew tired, but we stayed glued to the screen until Armstrong climbed down the ladder to make his "One small step for [a] man …" and grab the first sample of the moon's surface.

A few hours of science followed. Then the astronauts returned to the lander for another first: the return trip in the untested Lunar Return Module. Only years later would we learn how worried we should have been throughout the Apollo 11 mission. The planned landing field was strewn with hazardous boulders. The pilot rejected it at the last minute. The mission flew on searching for a safe spot. They landed with twelve seconds of fuel left for the descent engine. A key Return Module switch broke off and had to be jerry rigged for take off. There was no Plan B for those men on the moon.

The ascent engines worked as designed. They blasted of and returned to the Command Module orbiting overhead. From there, they flew back to Earth and splashed down safe. President Kennedy's challenge had been meet. All three Apollo 11 astronauts were welcomed as heroes.

June 19, 2019

Planetary atmospheres have been changing billions of years. The solar system began in the collapse of a cloud of dirty hydrogen. There was a bit of helium and traces of other elements in there. Helium is inert, the rest combined with whatever they encountered—generally hydrogen. The original gas has hydrogen with traces of carbon, nitrogen, and oxygen hydrides. As the largest blobs coalesced into gas giant planets, hydration proceeded to saturation—methane CH₄, ammonia NH₃, and water OH₂ formed. The atmospheres of Jupiter and Saturn remain that way.

Geology transformed the atmospheres of the smaller rocky planets. They cooled enough to allow the elements to rearrange into things other than their hydrogen compounds. The planets grew as bits and pieces bombarded them. Volcanoes spewed hot reactive materials into their air. Atmospheric chemistry evolved toward the most stable gases carbon dioxide CO₂ and nitrogen N₂: the composition of today's Martian and Venusian atmospheres.

Water altered the composition of planetary air. Venus cooled enough to host standing liquid water back when the sun was less intense. Earth's liquid water probably began beneath ice. Much of it still is under Antarctica today. Venusian geochemistry at that time is unknown, but probably paralleled Earth's. Cold water dissolved a lot of atmospheric CO₂ that reacted with seabed minerals to form carbonates.

Life evolved about that time. The first forms derived their energy from dissolved chemicals. When life diversified to take advantage of dissolved CO₂, life began to affect the atmosphere. Primitive plants practiced photosynthesis: consuming CO₂ and excreting O₂. Oxygen reacted with everything it encountered—iron, sulfur from volcanoes and atmospheric methane residues. Converting a strong greenhouse gas like CH₄ to a weak greenhouse gas like CO₂ precipitated a prolonged global ice age. Once those fuels were depleted, oxygen began to build up in the water and in the air. Oxygen was toxic to many early life forms, and a massive die off followed.

Oxygen in the atmosphere made modern plant and animal life possible. The symbiotic relationship between green plants and animals grew to dominate the planet. Atmospheric O₂ levels reached as high as 30% and now hold steady around 21%.

We don't know yet whether Venus went through a comparable phase of life modifying its atmosphere before the sun grew too hot for liquid water to exist there. Since that time, solar heat and radiation have driven the planet's atmosphere back to its most stable form: CO₂ and N₂. One day, our robots may explore Venus to understand what happened there and to prepare for what will happen here.

He who will not study history is doomed to repeat it. [George Santayana]

June 12, 2019

The most important sky show of all times will be rerun starting this week. Grab your binoculars or your telescope and witness what Galileo saw back around 1500 AD that changed the world.

See Jupiter as Galileo must have seen it. The brightest star in the sky will be obvious to the naked eye. Three or four of its satellites should be visible to amateur astronomers. It happens when Earth is aligned with Jupiter. The solar system moves like clockwork with Earth on a short minute hand revolving twelve times to Jupiter's one time—a longer hour hand. The view from one hand to the other is best when the two of them line up an opportunity that comes every thirteen month.

Professional astronomers will join amateurs taking advantage of this chance to view Jupiter up close. Their telescopes will survey the planet and its moons in detail. They'll pay special attention to the planet's atmosphere because something is changing in Jupiter's famous red spot—a storm that has been raging there for hundreds of years. NASA's Juno probe will continue its mission to Jupiter. It will swoop through intense radiation fields to take close up photos of the red spot and the planet's poles. We will continue to learn more about this behemoth every time it passes by.

June 5, 2019

Global warming: it's déjà vu all over again. What we're seeing today is just part of the natural climate cycle. We're all familiar with the twenty-four-hour temperature cycle we call day and night. We're all familiar with the twelve-month temperature cycle we call seasons. There's also a thousand-year temperature cycle we call climate. It's manifested in tree rings, in sedimentary rocks, and in ancient glaciers through the ages. Data spanning the last ten thousand years show Earth's average temperature oscillating by a degree or two on a thousand-year cycle.

The latest rounds are now history. The last epidemic of "global warming" ushered in the Medieval Warm Period that ran from around 950 to 1250 AD. The one before that was the Roman Warm Period that lasted from around 250 BC to 400 AD. There were lows between the highs. We're just recovering from a period labeled "The Little Ice Age."

Warm periods have always been high points in human civilization. In ancient times, Egyptian culture thrived in one warm period. Their architecture and construction have survived five thousand years so far. Greek civilization prospered in a later warm period. They invented philosophy and literature. More recently, the Roman Empire laid down the basis for modern society during the so-called Roman Warm Period. Elsewhere around the world, the Chinese united their country and built the Great Wall. Mayan architects and engineers built cities and turned swamps and jungles into farmland.

The cooling that followed the Roman Warm Period reduced crop yields. Starvation drove hordes from the north and east to sack Rome. The ages that followed were dark and cold.

The dawn of the Medieval Warm Period reversed those effects. The Renaissance resurrected art and science from obscurity. Agriculture spread north relieving hunger and breaking the stranglehold of feudalism. Vikings rowed their longboats through an ice-free ocean to settle in northern Canada. Further south, Inca and Aztec civilizations flourished. Their math and science led the world at the time. The ruins of their cities remain among the wonders of the world.

Progress slowed as the Medieval Warm Period came to an end. The Black Plague swept the Eastern Hemisphere and the Great American Epidemic devastated the Western Hemisphere. The interlude that followed hasn't been as dark as the one that followed the Roman Warm Period, but things are picking up as The Little Ice Age draws to a close.

There are good times ahead. The next warming period could herald another two or three centuries of progress and prosperity – led by America and China. It's coming. Don't fight it. It's be a blessing, not a curse.

May 29, 2019

Earth dodged a bullet Saturday night, May 25, 2019. An asteroid and its moon whizzed past. A mile wide rock approached at almost fifty thousand miles an hour. If it had hit Earth, the impact would have been an explosion bigger than all Earth's nuclear weapons combined. That would have been devastating, but it missed us – again. A miss is as good as a mile – or three million miles in this case.

This asteroid is an object whose orbit around the sun passes through Earth's orbit every six months. There was probably a lot of debris like it crossing Earth's path in the early solar system. In four billion trips around the sun, Earth has captured most of those. The few that remain are synchronized so they miss us on every pass – so far. No hits in four billion at-bats — impact seems unlikely, but it is not impossible.

Smaller bodies hit the Earth everyday. Most burn up in the atmosphere; a few survive to hit the ground. An explosive meteor strike in Siberia made the news recently. Truly catastrophic collisions are rare. One impact a hundred-and-sixty-five-million years ago is thought to have wiped out the dinosaurs. It could happen again. Astronomers track known asteroids and comets. They have predicted no major impacts during our lifetimes. Sky surveys identify more neighbors like Saturday night's visitor as well as interstellar intruders like 2017's Oumuamua. So far, no imminent dangers have been identified.

May 22, 2019

More alien than the moon or Mars and right under our noses, the ocean is cold and dark and deep. We've mapped the moon and Mars and South Dakota, better than we've mapped the ocean floor.

More people have been to the moon than have been to the bottom of the ocean—and they stayed longer when they got there. Texas multi-millionaire Victor Vescovo has set a depth record reaching the lowest point in the Mariana Trench 35,853 feet down. Upon reaching the bottom, he set another record by remaining at that depth for four hours. The first visitors to the moon stayed almost a day.

His Marianas Trench dive was the fourth in Vescovo's plans to visit the five deepest spots in Earth's oceans. The other four—runners-up to the Marianas Trench—have never been explored before. His fifth target—in the Arctic Ocean—awaits clearing of its ice cover by fall. Films of his adventures will be presented as a Discovery Channel series.

With no known energy source, it had long been theorized that there could be no life down there. Someone forgot to tell the natives. Vescovo viewed local animal life swimming under his submarine's floodlights at the bottom of the Marianas Trench. These included at least three previously unknown species.

Extreme depths occur at cracks in the Earth's surface. Shifting tectonic plates collide, and one sheet is thrust under the other and recycled back to the planet's liquid core. Elsewhere, cracks between spreading tectonic plates expose the molten magma of Earth's core. Volcanoes dot these fissures. Deep-water volcanoes superheat water and percolate minerals into the surrounding ocean. Smoking chimneys develop where hot water meets cold, and oases of exotic life form around them. Ecosystems based on hydrogen sulfide thrive in perpetual darkness there.

Two-thirds of Earth's surface remains uninhabited and unexplored. The variety there rivals anything we can hope to encounter elsewhere in our solar system. There's a strange new world just off shore waiting to be discovered.

May 15, 2019

Medical science hopes to open a new front in the war on infection with specialized viruses that kill lethal germs. Genetically engineered viruses may counter drug-resistant infections someday. A hundred years ago. infectious disease killed millions of people. Penicillin changed all that. It cured most infections and extended human life expectancy. Germs fought back. They evolved resistance to antibiotics. Higher doses and longer treatments were required. New drugs were developed, and germs beat them too. The fight goes on.

Experimental viral therapy may have helped fight one patient's deadly drug-resistant infection. The young woman was suffering from multiple life-threatening conditions. She became infected with Mycobacterium abscessus—a relative of the bacterial tuberculosis germ. Her infection did not respond to combined medical treatment for her infection plus her other ailments.

She needed something new. Doctors turned to an experimental therapy. They identified three viruses known to infect those specific bacteria. Yes, bacteria get sick and die—like every other living thing. All three viruses were genetically modified to make their attacks lethal to the host bacteria. The custom-made viruses were added to the patient's therapy regime. Her infection responded favorably to treatment.

These results are encouraging, but inconclusive. It's an isolated case—only the second apparent reversal of a drug-resistant infection by virus therapy. This patient was being treated for a laundry list of serious medical conditions. The contribution of her other therapies to the defeat of her bacterial infection is unknown.

Initial results seem promising. If custom-made viruses were required, wider application would be prohibitive. Leading laboratories are pursuing potent viruses for general application against drug-resistant infection.

May 8, 2019

Venus had lakes and rivers and seas once. Venus hosted liquid water while Earth was covered with ice and snow. If life evolved there during those billions of years, Venus might have been the Garden of Eden. Today, Venus is Hell and Earth is Paradise. What happened?

Our sun has been getting hotter since its creation. It was born in a swirling cloud of hydrogen. Gravity tugged the gas inward. Core pressures rose in the collapsing cloud. Hydrogen atoms were crushed to extreme densities. Those ignited nuclear fusion and a star was born. The collapse continued drawing more hydrogen fuel into the nuclear inferno. The sun's rays have been growing hotter throughout its four billion year history.

The sun bakes all planets. Planets too close to the sun are too hot to host liquid water. Far removed planets are too cold. Only those in between can have liquid water on their surfaces. The boundaries of that just-right zone vary with the sun's heat. They extend farther out as the sun warms.

When the sun was half as bright as it is today, Venus had water—and possibly life. Earth was a barren ice world. As billions of years passed, the sun grew hotter and the liquid water zone expanded. Earth's ice melted and Venus's seas evaporated. Solar radiation, heat and light transformed Venus' environment into today's toxic inferno.

Earth has basked in the liquid water zone since entering it billions of years ago. The sun continues to grow hotter, and the habitable zone boundaries continue to spread. The too-hot limit is approaching Earth's orbit. As it does, the planet will heat up. (This is not the "Global Warming" of political hysteria fame.) Liquid water will vanish, and air will grow poisonous. There will be no witnesses. By the time that happens: humans will be either elsewhere, or nowhere.

May 1, 2019

There's ample evidence that liquids flowed over the ancient planet's surface. There's plenty of wishful thinking and zero evidence that that liquid was water.

Mars has never been warm enough to host liquid water. The sun warms all the planets. The close ones are too hot for liquid water. The far ones are too cold. In between, The temperature is just right. This is the so-called Goldilocks zone where liquid water can exist. The sun has been warming over the past four billion years expanding this special region. Earth is nearing the end of billions of years in the zone. Mars has yet to enter it.

Mars was once in the Goldilocks zone for liquid natural gas, LNG. That liquid may have filled Mars' rivers and lakes then. That time has passed. Modern Mars is too warm for LNG and its rivers and lakes have all disappeared. Traces of methane in the atmosphere may be residuals of the planet's ancient climate. A vast liquid lake has been detected a mile beneath the south polar ice cap. Temperatures there make liquid water unlikely, but seem about right for LNG. Still more methane may be sequestered in Martian sands, just as it is on Earth.

Ancient Mars was not like today's Earth. It must have been more like Saturn's moon, Titan. Titan is in the LNG Goldilocks zone today. Data taken by the Cassini probe are showing an LNG-based climate remarkably similar to our own water-based climate. It rains LNG there. The seas, lakes and rivers are filled with LNG.

April 24, 2019

The sky got more complicated with the invention of the telescope around 1500. The center of the universe shifted from the Earth to the Sun. Planets grew moons. Some stars split in two or three.

The deeper we look, the more magic we find out there. More planets, more moons, and more debris. Some points of light turn out to be distant galaxies with billions of stars of their own. A black hole looks like Einstein's equations predicted. Nearby stars have planets—four thousand and counting. We see them jiggling their stars, or blocking a bit of their light. Many are bigger than Jupiter; others are smaller than Earth. Many are blazing hot; others are freezing cold. The variety seems endless.

George Lucas took us to Tatooine, a planet with twin suns. Astronomers are beginning to detect planets in solar systems with more than one sun. Two stars tumbling across the sky alternatively flash and eclipse each other. One moves away while its partner flies forward. Their light is both red-shifted and blue-shifted. A mere planet swinging around them is but a minor perturbation. Exacting measurements are required to detect those. Scientists are beginning to map solar systems around dual suns. Two new ones were announced last month. One has at least three rocky planets orbiting a pair of stars. The other includes a gas giant thirteen times as big as Jupiter around a red dwarf/white dwarf pair.

Such planetary systems are yet another mystery in the sky. Where did they come from? Colliding stars will ricochet off one another. Two stars can bind only if there's a third to carry away so much energy and angular momentum they can no longer fly apart. Astronomers see stars forming in vast interstellar nurseries. Most star pairs must form in that early crowded region. The young stars disperse and further pairing becomes rare. Was this month's gas giant a failed star orbiting one of the dwarfs and nearly ejected in capturing the other? Is our nearest neighbor star Proxima Centuri caught in a half million year orbit around Alpha Centuri A and B, or is it just passing through?

As astronomers' tools grow more sophisticated, we're uncovering more and more of Nature's secrets. Gravity waves have spotted neutron star and black hole collisions. A black hole's neighborhood looks like we expected. Solar systems come in many sizes and shapes. New telescopes and new technologies will show us things beyond our imagination.

April 17, 2019

Optics as big as the Earth took a black hole's picture.

Optics demands a telescope that big. Imagine looking at a distant star. When the cone of its light intersects a mirror, each ray bounces off at the angle it hit with. If the mirror is concave, the rebounding rays are focused inward. The right curvature directs them toward a point. It isn't actually a point; it's a blob that can't get smaller than the wavelength of the light. Now imagine a second star near the first. It casts a slightly different cone on the mirror, so light bounces off at slightly different angles. If the second focuses inside the blob of the first, there's only one image.

A larger mirror samples more of both light cones. Focal points shift with widening observation angles. A wide enough mirror resolves the separate spots. Alpha Centuri, the brightest star in the Southern sky, is a single point to the naked eye, but three on closer inspection. Quantum mechanics limits the size of optics to separate objects at a distance. Resolving the neighborhood of a black hole light hours across from a distance of fifty-five million light years requires planet-size optics.

You can't build a mirror that large. Fortunately, a less-than-complete mirror can still produce an image. A mirror with a piece missing will still make an image—just a little darker. The same with two pieces missing…or three. The remaining pieces still direct light toward the focal point. An international team of astronomers, the Event Horizon Team, combined eight telescopes scattered across a hemisphere to obtain the now famous black hole photograph. The entire network focused on the target for simultaneous observation. The light received was not reflected to a physical image plane. Instead, the photograph was computer-generated. Volumes of data far too large for modern data transmission technology were recorded and delivered on hard discs. The individual calculations involved were straightforward, but the number required took a supercomputer.

The black hole picture was the first of its kind. Now that the technology has been demonstrated, the sky is full of mysteries waiting to be seen. Proxima centuri b and other nearby exo-planets are obvious targets. If Moore's Law (computer technology doubling every eighteen months) continues, observations like these may become routine in fifteen or twenty years. The next step beyond will expand to the moon and its Lagrange points. That would add a ring of detectors: one on the moon and three more trailing one third, one half, and two-thirds of the way around the moon's orbit. With Earth-based systems in the center, those would create a virtual telescope with a half million mile wide mirror.

April 10, 2019

Long ago and far away, two neutron stars collided. Their violent impact scrambled local space and time. The bang sent a ripple spreading across the universe. It was so intense that it was still detectable when it reached Earth 135 million light years away in 2017. All astronomers' telescopes turned to view the cosmic debris from the most powerful explosion ever recorded.

A gamma ray burst followed close behind the gravity wave. It signaled nuclear reactions never seen before had happened out there. The glow from the ejected cloud showed heavy elements—probably the products of those reactions. In the beginning, everything was hydrogen. Stars turned hydrogen into helium. Dying stars collapsed and crushed all that was left into additional elements up to iron. Production of elements beyond—gold, silver, platinum, and fifty more—required far harsher conditions.

Shock waves in neutron star collisions generate temperatures and pressures even beyond those inside stars. They are thought to be high enough to host heavy element production. Neutron star collisions' contribution to the inventory of heavy elements is undetermined. Are they the source? Are they the only source?

Future neutron star collisions will provide scientisits with data to advance our understanding of the nuclear physics of element synthesis. Heavy element nuclei are believed to grow through addition of neutrons in a neutron-dense environment. The nuclei created by neutron addition are usually unstable. They decay quickly. When another neutron is absorbed before that decay, the rapid process—physicists call it the r-process—builds heavier and heavier nuclei. Most fall apart. A few emit a gamma ray and become stable. Some emit an electron to become a different element. Theoretical calculations estimate neutron densities and energies are high enough to support such r-process syntheses during neutron star collision shock waves.

Detection of heavy elements in the aftermath of this first impact incident is consistent with their production during the event. The output of the next one will provide further data to better understand the nuclear physics within. The astrophysics community is preparing for the next alert by surveying known isotopes to identify signatures that might help bound the nucleosynthetic processes happening during such collisions. A Notre Dame group identified Californium-254 as an isotope to look for. It lasts weeks: long enough to be detected but not long enough to have come from somewhere outside. Its presence would confirm synthesis of elements beyond uranium there. The forthcoming Facility for Rare Isotope Beams at Michigan State University will generate a host of previously uncharacterized isotopes. Understanding these may highlight specific data to be sought the next time. Colliding neutron stars will provide a nuclear physics laboratory not possible on Earth.

April 2, 2019

Fake news is making children sick. The most diabolical post of all time is the claim vaccinations cause autism. Its author was a physician employed by a law firm then suing a pharmaceutical firm that made vaccines. The alleged study was pure fiction. The paper has been retracted, and its claims rebuffed. The author's medical license has been pulled. Nevertheless, mistaken claims still flood the Internet today. Concerned parents believe them, and refuse to vaccinate their children. Unvaccinated children are vulnerable to whatever scourge they encounter.

Vaccines make the world a healthier place. Nightmare diseases like polio have been all but eliminated. Only a few zealots—like the Taliban—refuse polio vaccination and allow pockets of the disease to persist.

Measles were eliminated throughout the Unites States decades ago. The rest of the world trails behind. Unvaccinated world travelers bring measles home with them. A single Disneyland visitor infected with a Philippine strain started a measles epidemic among the unvaccinated a few years ago. This year, an Israeli strain is spreading among the Ultra Orthodox Jewish community, and a European strain has infected hundreds in other communities. As the disease spreads, so do efforts to contain it. Unvaccinated children have been asked to stay home from school. Quarantines are now in effect in hard-hit areas: unvaccinated children are banned from public places. Vaccinations can stop this epidemic in its tracks.

Vaccinations won't cause autism in your children, but they may cure ignorance in their parents. VACCINATE!

March 27, 2019

Some planets have suns; some don't. The more we stare at the sky, the less special we learn we are. There are two hundred billion stars in the Milky Way. Many of those may be suns hosting solar systems of their own. Nobody has actually seen an extra-solar planet yet, but we've detected four thousand of them orbiting nearby stars. Astronomers have seen stars stagger as giant planets swing around them. They've detected planets' shadows as they block their star's light in passing. Next generation telescopes may capture images of exo-planets reflecting their host star's light.

Planets floating free of any star will be even harder to detect. It's dark out there. There's no light for them to reflect. It's cold out there. Their outsides have cooled to the near absolute zero temperature of space, so they don't glow. Some twenty rogue planets have been detected when they fortuitously obscured the light from a distant star. Bending of that light by the rogue mass indicates it's there, and hints at how big the thing is. If twenty have shown up already, there must be a lot more out there,

Where did all these mysterious planets come from? Planets form along with their host stars. The unattached had to have gotten separated from their solar systems. Violent incidents capable of separating a planet from its star are most common early in the life of a solar system. Stars form in vast interstellar clouds. Hundreds of them form there around the same time. Many have planets growing in the dusty discs swirling around their midsections. Juvenile stars bump each other in that overcrowded star-forming pocket. A University of Leiden study illustrates the effects of stars' violent beginnings. The team simulated a swarm of fifteen hundred sun-like stars formed in such a cluster. They let their model star system percolate for a million years to remove any bias caused by arbitrary selection of the cloud's initial conditions. Then the team added planets orbiting five hundred stars—four, five or six apiece. Their computer tracked the motion of these more than four thousand objects through the next ten million years as the cluster drifted apart.

Approaching stars jostled planetary systems. A crossing star's gravity distorted bound planets' trajectories or yanked them from their orbits. Interplanetary collisions exacerbated the passing star's effects. Gravity scrambling of a planetary system or intrusion of another star's planets led to occasional impacts. Planets ricocheted out of their paths. About one in seven planets was ripped from its star over those ten million years. A few of those were captured by another star later on. The rest became rogue planets. Most drifted out of the star cluster within the time span of the simulation. Extrapolating the Leiden study results suggests that processes like the ones they studied may have generated fifty billion rogue planets—Earth-sized to Jupiter-size and beyond—in the Milky Way Galaxy.

If there is that much planet-size debris, there must be a lot more rubble out there. Oumaumau is an asteroid-sized bit of rogue space junk. It came out of nowhere in 2017, raced through the plane of the solar system, and out the other side. Had it been a Jupiter-class rogue, our solar system might be a different place today.

March 20, 2019

The solar system bears the scars of growing up in a rough neighborhood. Pluto's orbit is squashed and skewed. There's been a planet or two knocked out. The giant planets are far removed from where they were formed. Comets come predominately from one small sector of the sky. Most of these things happened before life on Earth began.

The sun—like most stars—formed in a vast star-forming cloud four billion years ago. Hundreds of stars all formed there around the same time. Many had planets growing in the dusty discs swirling around their midsections. Juvenile stars bumped each other in that overcrowded star-forming pocket. A University of Leiden study illustrates the effects of stars' violent beginnings. The team simulated a swarm of fifteen hundred sun-like stars formed in such a cluster. They let their model star system swarm under its own gravity for a million years to start. This would remove any bias caused by arbitrary selection of the cloud's initial conditions. Then the team added planets orbiting five hundred suns—four, five or six apiece. Their computer tracked the motion of these more than four thousand objects through the next ten million years as the cluster drifted apart.

In the Leiden simulation, passing stars jostled planetary systems. Planetary systems were scrambled, and orbits distorted. Some planets were even yanked them from their host stars. Interplanetary collisions compounded the passing star's gravity effects—especially among the outer planets. Gravity-induced planet shuffling and intrusion of another star's planets both caused impacts. Ricocheting planets were thrown into new orbits or ejected from their solar system all together. About one in every seven planets was detached from its star over those ten million years. Planets not ejected often had their orbits perturbed. Many—especially outer planets—were shifted into elliptical orbits often out of their original plane.

Our solar system shows the vestiges of this kind of violence in its past. The giant planets of the outer solar system are out of place. They have to have formed close to the sun where the primordial cloud carried enough material to make them. This is the normal pattern seen in the four thousand known planets of other stars. Many are "hot Jupiters" gas giant planets orbiting close to their stars. The sun's giants must have formed near the center of creation—not in the wispy outer regions. Only extreme violence could have dragged the solar system's four giants out to the edge of the universe where they sit today. Computer simulation of that process shows there must have been five or six in the beginning. Collisions with Jupiter are thought to have ejected the one or two missing planets from the solar system.

That incident was probably only the most severe of a number of early impacts shaping the solar system of today. Pluto revolves around the sun in a squashed ellipse torqued away from the plane of its fellow planets. Similar orbit distortions were found in the Leiden simulations. Most comets come from one area of space where a companion star grazed the outer solar system a few billion years ago. Astronomers are just beginning to map what lies beyond Pluto. Preliminary results suggest some kind of shepherd acted on the far-flung bodies out there. Astronomers are searching the sky for the postulated Planet Nine—a super-Earth orbiting far beyond Neptune.

March 13, 2019

Combat is safer than doing drugs. According to the latest National Institute of Health statistics the 702,566 twenty-first-century drug overdose deaths (1999-2017) exceeded the 641,005 US combat deaths in all our wars combined. The number of peripheral drug-induced disabilities among our fellow Americans compounds this tragedy. These numbers do not include the carnage here and in Mexico in gangland wars over who sells us this poison.

The 399,232 opioid overdose deaths alone are approaching the 426,069 US combat losses in all our twentieth-century wars put together. The synthetic opioid fentanyl is singled out. It has killed 93,151—more than our 81,110 combat losses in Viet Nam and Korea combined—nearly twice the 53,402 Americans killed in World War I.

The war against drugs is a world war—a world war we are losing. Afghan opium growers and Chinese fentanyl labs are killing Americans. Controlling those sources and their pipeline into our country may be part of a winning strategy. In 2018, ICE intercepted enough fentanyl to kill the entire US population, but that wasn't enough. As long as there is a demand for drugs, there will be a supply. An assault on the criminal elements that market these lethal drugs to us is necessary, but it will not be sufficient. Even prosecutions for capital murder have not deterred drug dealers. Rival gangs are a more credible threats than any US law enforcement.

We need to get today's users off drugs and discourage tomorrow's users from starting down the path to hell. Medical intervention and organizations like Narcotics Anonymous can't keep up with the onslaught. More is needed.

March 6, 2019

Manned spaceflight is returning to the USA. Ongoing success of SpaceX tests promise crewed flight within the next few months. That will be the first time Americans have flown into space on American rockets since Obama cancelled the US manned space program in 2011. Private companies are stepping in to the market for spacefaring with SpaceX and Boeing leading the way.

An unmanned SpaceX Dragon capsule was launched on a SpaceX Falcon rocket. It navigated to the International Space Station where it docked automatically. (The current space taxi—the Russian Soyuz capsule—requires human guidance and a mechanical assist with the Station's robot arm.) When Dragon splashes down in the Atlantic Ocean, it should be authorized for human transport. The Dragon/Falcon configuration may begin ferrying astronauts to the Space Station by summer.

Engineering is mere months behind for the competing Boeing system. Their Starliner capsule is poised for a comparable test flight in April. By 2020, these two companies should begin competing for the taxi-to-orbit business. One or two other firms should follow soon after.

The SpaceX and Boeing capsules are designed for a full-fledged return to space. They will soon go beyond the International Space Station. SpaceX is reported to have already sold tickets for a round the moon loop in a Dragon capsule launched on a Big Falcon Rocket. That trip will zoom out past the moon on an assured-return trajectory. The passengers—the first space tourists—will look down on the far side of the moon as they fly over it. The Boeing system will be moon-capable as well.

The two company's systems will enable the USA to orbit the moon or land on it. President Trump has directed NASA to prepare to do so. Landings, extended exploration, and settlements should follow. Commercialization of space may begin. FedEx long range planning is rumored to include lunar deliveries.

February 27, 2019

Kelp mops up CO₂. A quarter of all the CO₂ humans emit ends up in the ocean. There, kelp and other green plants can sequester it in the biosphere. The underwater process happens just like the one on dry land. There another quarter of available CO₂ is removed. Photosynthesis transforms the gas into sugar. Plants and animals then further convert that sugar into all the other organic materials of life. Little is returned to the environment as CO_2.

Kelp is giant green algae with a ferocious appetite for CO₂. Given ample sunlight and CO₂, it can grow two feet a day. Underwater jungles of 175-foot tall kelp store vast tonnages of CO₂. Like most sea life, kelp flourishes in cold water, but suffocates in warm. The main components of air—N₂, O₂, Ar, and CO₂—all boil away like the bubbles from an open soda. There's little CO₂ available to store energy and little O₂ to use it. Life grinds to a halt. A series of warm water events have devastated Australian and Californian kelp fields. Recovery is slow.

Excess CO₂ acidifies water. In normal water, a few H₂O molecules break apart into an H+ ion and an OH- ion. Ideally, there are about a hundred parts per billion (ppb) of each. Dissolving other things in water may shift those concentrations: more H+ is acidic, and more OH- is basic. Solubility varies with the H+/OH- balance. When CO₂ dissolves in water, some of it reacts to form carbonic acid H₂CO₃. Like water, a few carbonic acid molecules fall apart into a H+ ion and a HCO₃- ion. The additional H+ ions shift the balance toward acidity.

Life in the ocean evolved in water with a few thousand ppb of OH-. The few extra H+ ions from CO₂ shift the ocean environment. Much ocean life is affected. Shellfish are especially sensitive to this shift because acids dissolve their shells. Shellfish farmers are testing kelp plantings for possible local relief from acidifying their clam and oyster beds.

February 20, 2019

What's Mars made of? NASA's newest Mars mission is about to find out. The latest robot, named Insight, is parked near the planet's equator with a suite of geophysical instruments. Astronomers' telescopes and orbiting spectrometers have mapped the surface composition. Earlier Mars probes brought chemistry sets to spot check those results. Mars is covered with dry dirt and rocks—no surprise. Satellites have charted local gravity variations and applied ground-penetrating radar to identify subsurface features. Like Earth, there's even a lake buried deep under Mars' south pole. Many assume it's filled with brackish water, but liquid natural gas seems just as likely.

Insight's data will help us better understand the modern-day structure of our sister planet, and its evolution. The rocky inner planets of the solar system—Mars, Earth, Venus, and Mercury—were formed together. The more we learn about their similarities and differences, the better we can understand our Earth—where it came from and where it's going.

Mars must have had a molten core like Earth's at one time. The planet's hosting the universe's largest volcano attests to that. Martian volcanoes are all quiet now. What happened? Are the core's remnants still hot and conducting heat into the surrounding body of Mars? Insight will try to drill a 16-foot deep hole and place thermocouples there to measure subsurface heat flow. If Insight doesn't hit a rock along the way, a clear picture of the evolution of Mars may be forthcoming.

Seismic events and their echoes will reveal what lies beneath the Martian surface. Insight will use classic seismology techniques to measure the structure in depth. Here on Earth, engineers set off explosions and use echo location to map geology. They listen for shock waves coming straight from the explosion, and then those bouncing off underground layers. The echoes produce a three dimensional image of what cannot be seen. Insight will try to do something similar on Mars. It will have to get along without explosives though. Instead, Insight will wait for Marsquakes and meteor strikes on the surface. The planet's thin atmosphere offers little protection from meteors, so 10 to 200 detectable events per year are expected.

Insight data will provide the first detailed look at the interior of another world. Similarities to Earth's geology will help us better understand our home planet. Differences will generate new mysteries. We'll have to wait and see.

February 13, 2019

A true two-dimensional material, graphene fascinates physicists. Graphene is even stronger than diamond. It wouldn't melt on the surface of the sun. This recently isolated carbon crystal also conducts heat faster than diamond, and transmits electricity better than silver. It's the basic building block of familiar forms of carbon as well as some of the latest carbon composites. It's a subject of active research interest in both fundamental and applied physics.

One atom thick, graphene acts as a two dimensional material. One pound of graphene has an area estimated to cover more than half a square mile. Its structure gives it some unusual physical and electrical properties. It's a sheet of six carbon atom hexagonal unit cells like chicken wire. There, each atom is locked to three adjacent atoms—thus its phenomenal strength. Each carbon atom contributes one extra electron to a delocalized swarm of electrons above and below the plane—thus its special electrical properties.

The electrical properties of graphene suggest practical applications. Electrical uses under investigation range from quantum computers to improved solar panels. Those could be more efficient and would avoid the exotic metals of today's units. Something strange happens when two layers of graphene are laid one atop the other. Usually they exhibit the same electrical properties as single layers. But when they are cooled almost to absolute zero (-459°F) and twisted ever-so-slightly by 1.1°, their electrical resistance vanishes and they superconduct. This magic angle shifts only slightly when the two sheets are crushed together under thousands of atmospheres pressure. Why and how this happens is a subject of active research at laboratories worldwide. Understanding its origin may contribute to the search for practical superconductors that could reduce the cost of transmitting electricity.

February 6, 2019

Gene therapy may cure sickle cell anemia. The first test subjects have achieved healthy red blood cells running through their veins. Only time can tell whether their relief is permanent. A practical and effective cure would be a boon to the hundred thousand Americans with the disease…as well as millions more worldwide.

Sickle cell anemia evolved as the lesser of two evils in malaria-prone areas. Malaria bacteria cannot live in the diseased red cells of sickle cell anemia. The carriers are immune to the world's leading killer of women and children. It's not much of a trade off though. Sickle cell's defective hemoglobin lasts weeks instead of months, leaving victims anemic. Misshapen blood cells get snagged in narrow blood vessels, cutting off circulation to critical organs. Sickle cell incidents are painful, often deadly.

This is a well-understood hereditary disease, so it's an obvious starting point for gene therapy. The disease stems from a single protein defect in the hemoglobin produced by the victims' bone marrow. That deficiency is the result of one mutation of a single gene. Correcting that one error should be the route to a cure. Two such promising approaches are under study. One tactic harvests stem cells from patient bone marrow and uses special viruses to inject proper hemoglobin genes into them. Another approach uses gene-editing techniques to correct the stem cell genes. Stem cells with the corrected genes are infused back into the body intravenously. Those returning to the bone marrow begin making normal hemoglobin. Both are showing preliminary signs of success.

Another alternative takes a quite different track. The body has two seperate ways to produce hemoglobin: fetal and adult. In utero, a baby's blood is normal. Only after birth does the body produce the defective hemoglobin. Reactivating the fetal hemoglobin cells while suppressing the adult ones also appears promising.

All three methods are being explored in parallel. Initial successes have encouraged the National Institute of Health to increase research funding to cure sickle cell anemia. A cure may become available in three years or so. Progress here will lay the groundwork for other advances in gene therapy.

January 30, 2019

Martian explorers lived in Hawaii. There was a Martian outpost atop Mauna Loa, an active Hawaiian volcano. NASA sent Mars astronauts to its Hawaii Space Exploration Analog and Simulation (HI-SEAS) facility to study non-engineering aspects of visiting Mars. Crews spent months in mock Mars missions to test the psychological effects of isolation and crowding.

Teams of six explorers lived and worked in a 1200 square foot structure—a cramped dome small enough to be transported to the red planet. They existed on government issue freeze-dried meals and limited water. Communications with home were delayed 40 minutes—just like a real Mars mission. Weekly 30-second showers and a shared chemical toilet added to the ambience of the facility.

Going out for a walk offered no relief. The mountaintop was barren and virtually lifeless—much like real Martian terrain. Once a week, crew geologists explored the lava fields in full space suits. Habitat maintenance was also performed in cumbersome space suits. Remote-controlled robots performed more distant outdoor tasks.

Expeditions lasting up to one year ended without serious psychological or morale issues like those encountered in earlier longer-duration experiments. This is about as long as the first Mars mission is expected to spend on the planet. The results encourage NASA planners that a Mars mission could succeed.

The Martian explorers have gone home. HI-SEAS is being reconfigured for new guests: moon people. We'll return to the moon—this time to stay—long before sending astronauts to Mars. We'll debug lunar living atop this Hawaiian volcano.

January 23, 2019

Clearly the handiwork of the devil, lunar eclipses terrified our ancestors. They were omens scary enough to alter history. A total lunar eclipse like the one this week almost ended English colonization of America in 1635.

New England was cursed. The devil was working his evil magic everywhere there. The young colony was struggling. Colonists were freezing. Colonists were starving. Colonists were dying. A storm beyond their wildest nightmares struck on August 16, 1635. Class 3 hurricane winds toppled trees and drove twenty-foot surf ashore. People were dragged out to sea. Heavy rains compounded the flooding. Crops were ruined. Ships in port were dashed against the shore and shattered with nearly total loss of their crews. Plymouth reported forty-six killed. (The actual number was probably higher—women, children, sailors, servants and Indians weren’t necessarily counted as people then.)

Eleven days later, the devil attacked the little settlement again. The storm survivors watched the moon rise and then disappear. In an eclipse much like this week’s, a shadow spread across the moon. The moon vanished for hours before slowly reemerging in the sky. This was the work of the devil. The colony was cursed.

New England was the devil’s playground. Many colonists wanted to return to England. If they had, the local geography and history would be different today. Instead, they stayed and spent the next fifty-eight years purging New England of the devil’s disciples. He had spawned many witches and warlocks in that tiny outpost. Their zealous persecution forestalled further evil events like lunar eclipses.

January 16, 2019

SpaceX's Starship, nee Big Falcon Rocket, solves the easiest of the problems of colonizing Mars. It's just engineering. Humans already know how to make rockets, and have been building larger ones for nearly two millennia. SpaceX unveiled a prototype rocket large enough to carry men and machinery to the moon or Mars.

The rocket science is the easy part. Humans are not so easily reengineered for this new environment. Mars immigrants face eight months to a year on weightlessness in transit. The crippling effects of six months of zero-g aboard the International Space Station does not bode well for the colonists' condition on arrival. Their recovery to a new normal condition under one-third gravity is unknown. The psychological effects of years crammed together may be as debilitating as the physical effects. Simulated Mars missions atop a Hawaiian volcano highlight potential problems. Crew relations sour and crew morale degenerates. Remember those experimental astronauts arrived by car, not after being jammed together in a Greyhound bus-size space capsule for eight months.

Radiation exposure compounds the problems of weightlessness, loneliness, and overcrowding for Mars's pioneers. Beyond Earth's magnetic field, intense radiation from the sun, the solar wind, beats down. Radiation health effects are cumulative. It damages DNA. All the body's cells are vulnerable—especially reproducing cells. Replacement blood cells are diminished. White cell shortage leaves the patient vulnerable to infection; red cell shortage makes the patient lethargic. Nausea and vomiting are common even at therapeutic doses. Exposures exceeding radiation therapeutic doses will occur with lethal consequences. Systemic damage from higher doses cripple or kill the victim.

Adequate shielding for the trip to Mars will be heavy. Radiation protection on the Martian surface will be developed to support the lunar outposts that must come before them. Practical protection for man and machines may prove inadequate against solar flares. Man's final frontier will not be easily conquered.

January 9, 2019

Are you lonesome tonight? Elvis Presley sang a dismal picture of loneliness fifty years ago. It's no better today. Researchers report an epidemic of loneliness across the country today. (It's unclear how much of the increase cited is just someone finally stopped and looked at all the lonely people.) Studies show loneliness peaks in three age brackets:

· Twenty-somethings torn away from school. Their friends scattered to the four winds. Thrust unprepared into the adult world.

· Mid-fifties sensing they are not immortal. The kids have moved away, and the social structure built around parenthood crumbles.

· Eighty-year-olds who have outlived their social structure.

Loneliness has consequences. It may be more than just having a bad day now and then. It can contribute to clinical depression and post-traumatic-shock-syndrome. Such despair ruins victims' lives and often ends them. The current rash of suicides among young veterans may be one manifestation of the loneliness epidemic.

Loneliness also adds to death by natural causes. A list of the physical diseases thought to be exacerbated by loneliness include Alzheimer’s, obesity, diabetes, high blood pressure, heart disease, neurodegenerative diseases, and even cancer—tumors seem to metastasize faster in lonely people. It's unlikely that loneliness causes many of these illnesses, but it probably inhibits recovery from them. It's the placebo effect or faith healing in reverse. Belief accentuates the ups and diminishes the downs; the patient feels better and gets better. Loneliness masks the ups and highlights the downs; the patient feels worse and gets worse. Attitude cures or kills.

Seek professional help when loneliness seems serious. Be proactive to avoid its growth. Communicate better with the people you meet. Look them in the eye when talking, and really listen to them. Listen to respond, not to rebut. Organizations like Toastmasters can help.

Go out and find unconditional love for yourself. GET A DOG.

January 2, 2019

Water is weird. The gas is far from ideal. The liquid is odd. The solid is bizarre.

Ice, the familiar solid form, packs water molecules in an open crystal structure. The oxygen atoms are bound into hexagons held together by bridging hydrogen atoms. The whole assembly looks like a microscopic honeycomb. There's lots of empty space within. Add a little heat and the bridging bonds shake and begin to break. The lattice structure collapses. The shards tumble into the voids. The ice has melted. More heat breaks the fragments up further. The smaller bits fill the open spaces better, and liquid water contracts as it warms. It reaches its peak density at 4°C (39°F) and then expands like a normal liquid after that.

Molten ice is denser than its solid form. So ice floats on water. (Other solids precipitate in their liquids.) Ice displaces its own weight in its water host—exactly the volume it will have when it melts. That's why melting ice doesn't overflow your glass, and why melting icebergs don't raise sea level.

Liquid water expands when it freezes. There's a considerable force required for that. It's strong enough to shear rocks, or burst water pipes. When outside pressure becomes too high, liquid water remains liquid. Its freezing point drops. The continent of Antarctica, and the moons Europa and Enceladus are blanketed with miles of ice. There, rivers and lakes of liquid water flow beneath tons per square inch of ice overhead. Pressure can melt ice—that's how ice skates work. Put your entire weight on the area of the blade and you exert enough pressure to melt the ice beneath. You glide on that film of wet ice.

Common ice is only one of many forms of crystalline water. Water molecules are like a triangular Lego blocks. They lend themselves to assembly into a variety of shapes. Today, seventeen stable or metastable crystalline ice structures have been identified—most have been created in the lab. Two low-temperature solid forms exist at normal pressure. A dozen more ice crystal forms occur under higher pressures. The full map of their preferred temperatures and pressures resembles a patchwork quilt. Water may exist naturally in some of those forms on giant planets.

Water is everywhere in the universe. Most of it is in none of these forms. Transition into and between these ordered forms takes time and energy. Most extraterrestrial objects are too cold for that to happen. Water molecules or droplets are flash frozen on capture in space—an amorphous blob results. This disordered mass is a supercooled liquid. It's cold and it's hard; it's just another part of the strangeness of water.

December 26, 2018

There's water on Mars—solid water. Mars Express, a European satellite, has mapped a patch of ice twice the size of Rhode Island. This mile thick slab of ice lies at the bottom of a deep crater near the north pole of Mars.

Water is nearly everywhere throughout our solar system. There's ice in the canyons on the dark side of Mercury. The sun's heat and the solar wind have driven water off Venus. Here in the Goldilocks zone, Earth has solid, liquid, and gaseous water. Solid water is common out beyond Earth's orbit. Comets are icy rocks. Their ice sublimes away during close encounters with the sun. (A comet's tail is just the light of the sun reflecting off its trailing water contrail.) Asteroids, moons, and planets orbiting out beyond the Goldilocks zone host year-round patches of ice. Some—like the moons Europa and Enceladus—are covered with miles of ice on top of lakes or seas of liquid water. Antarctic rivers and lakes are thought to be similar to those of these alien moons.

Water on Mars does not equate to life on Mars. Neither does its solid state negate the possibility. The search for life on Mars continues with the robots roaming the planet's surface, and new ones on their way there.

December 19, 2018

Despite advances in medical science, life expectancy is falling. Too many young people are killing themselves—killing themselves with drugs, killing themselves with cars, killing themselves with guns, killing themselves with,..

Drug overdoses are the biggest cause of preventable death in America today. Fentanyl and other opioids are killing users, plus those who treat them, and those who police them. Almost fifty years of our war on drugs hasn't worked. The next step toward controlling this opioid epidemic may be political. These deadly drugs are smuggled across the Mexican border to domestic drug distributors. Tightening controls at the border could strangle the illegal drug traffic. These drugs are not made in Mexico; they're imported from illicit labs in China. Diplomacy may induce China to police its pharmaceutical industry. These are just two of the ways the president is working to combat our opioid overdose epidemic.

Drunk driving, drugged driving, and distracted driving kill nearly as many people as opioids do. Severe penalties and rigorous enforcement have done little to curtail that one more for the road. Again this year, drunk drivers will ruin the holidays for families all over the country The struggle against drugged driving has only begun. We can't fully assess how big a problem it is. The statistics aren't available yet. The surge in traffic accidents and traffic deaths in states legalizing marijuana are the tip of the iceberg. They demonstrate the problem is huge. And then, there's the cell phone. Our young are talking and texting themselves to death while driving.

Drunk drivers, drugged drivers, and distracted drivers don't do a whole lot better when they step out of their cars. Every week, we read about someone who walked or biked into oncoming traffic or in front of a train. Bicyclists and pedestrians don't fare well in those encounters.

Suicide is growing to epidemic proportions. Three out of four gun deaths in this country are self-inflicted. Too many of these are young veterans neglected by the VA. Victims using other lethal means exacerbate this death toll. The true suicide rate is seriously underreported. What fraction of the so-called traffic accidents are actually suicides? How many one-car accidents? How many wrong-way freeway drivers? We're losing a lot of people we shouldn't. Many of their deaths could be prevented. If you know someone on the edge, get help. Call the suicide prevention hotline 1-800-273-8255. Remember the holidays are peak suicide season. When in doubt, help out.

December 12, 2018

Octopus and squid are smarter than they ought to be. They use simple tools in the wild. They solve mazes and puzzles in the lab. They poach fish from neighboring aquariums in captivity, and slink down lab drains back to freedom. Born orphans—these animals are neither trained by their elders, nor socialized by their peers. They're smart without education.

Their ancestors evolved the brainpower to rule the oceans 275 million years ago. Their progress ended there and the world passed them by. Life in the ocean went from sponges and snails to dolphins and whales. Life crawled out of the oceans and joined primitive cockroach ancestors on land. Life here advanced into today's flora and fauna. Octopus and squid—once top predators—remained as they once were.

Each octopus or squid is limited to the brains it was born with. There's no telling what they might have achieved if they had educated their young. What might they have become with few hundred million more years of evolution? Could they have developed an advanced civilization? That's the history of the extraterrestrials visiting Earth in my Dead Astronauts novel. Read an excerpt.

December 5, 2018

Give a child a book to plant the seeds for a lifetime of success. Reading for homework garners the stigma of "work." Reading for fun creates a healthy addiction to books instead. This year, make sure there's a book under every kid's tree.

Readers prosper. Ben Carson is the poster child for reading. He escaped the depths of the ghetto through books. His uneducated mother demanded better for her sons. She required they read two books a week. Those inspired Carson's pursuit of learning. Books transported him from abject poverty to the pinnacle of success. This offspring of a single mother grew up to be one of the world's top neurosurgeons, then a candidate for President of the United States, and now the Secretary for Housing and Urban Development. Dr. Carson is a model for what is possible.

Ben Carson also the inspiration for Col James "Buzz" Sherman MD, Flight Surgeon and Deputy Commander of the Mars 1 mission in my novel Stranded on Mars. Like the real Dr. Carson, books raised the fictional Dr. Sherman to prominence. By contrast, his political appointee crewmate, Luther Queen, is into video games.

Young adults of all ages may enjoy reading Stranded on Mars. (This is hard science fiction in that the science is solid.) Any of my fiction or nonfiction books offer entertaining reading for the future booklovers on your gift list. Click on any cover above to sample your gift to them. Their journey to a life of literacy starts with you.

November 28, 2018

The vast Martian oceans are a figment of some computer's imagination. Mars rovers detected traces of perchlorates in Martian soil. Mars satellites mapped perchlorate deposits all over the planet. Here on Earth, perchlorate formation is often associated with ocean water. Wishful thinkers interpreted the prevalence of perchlorates on Mars as evidence of past oceans there. Rigorous reexamination of Mars orbiter data shows the inference of perchlorates is a computer programming error. The reported perchlorate expanses do not exist. The data do not support aqueous oceans on Mars.

Mars orbiters survey the planet with hyperspectral technology—technology at the forefront of the state of the art. On Earth, or on Mars, high-flying or orbiting camera-like instruments collect light from below in a line of pixels. Move forward: click another line, and another, and another. Line-after-line creates a picture of the terrain. Recording only the brightness of each point makes a black-and-white image; three colors yield a normal color picture. Hyperspectral imagers capture a few hundred infrared colors. The local spectrum of each pixel is inverted to infer the composition of the area imaged. The results provide detailed maps of the chemistry of the zone.

Hyperspectral data overwhelms computers. There's just too much of it. Sophisticated algorithms handle straightforward situations. There's always a complex condition beyond the computer's competence. Programmers can't think of everything. That's when humans need to step in. For the Mars orbiters, areas including mixed terrain weren't handled properly. The erroneous results suggested perchlorates in the shadows. Hurray! That's what the investigators wanted to see. Human checking discovered the misinterpretation. Perchlorates and oceans vanished.

November 21, 2018

We are not alone. There is other intelligent life on Earth. It's swimming just offshore.

The more we learn about Cetaceans—toothed whales—the more like us they become. Dolphins and orcas are the oceans' top predators. They rule the seas much the same way humans rule the land. Advanced communication and social skills make us number one. We both apply those skills to pass our cultures on and to train our young. We work together to address threats beyond our individual abilities. Lions and tigers and bears seldom eat humans; sharks flee dolphin packs.

A considerable level of communication has been established between members of the planets two dominant species. Captive Cetaceans have been trained to perform complex tasks for humans. Killer whales have been found to adopt personality traits emulating those of their trainers. Earth's intelligent creatures are interested in the animal life around them. Humans have pets, rescue animals, and keep zoos—including aquariums for dolphins and killer whales. A pod of beluga whales has adopted a narwhale calf. Tales of dolphins rescuing people abound. How interested are they in the humans they share the planet with? Fish Story tells a tale of people kept by dolphins. Read an excerpt telling of their capture.

November 14, 2018

Organic compounds on Mars don't indicate life on Mars—or not. NASA's Curiosity rover found carbon-bearing compounds in a dry Martian lakebed. Interpreting those results as indicative of life there would be premature. Once upon a time, humans thought carbon compounds could only be made by living things—thus the study of carbon chemistry was mislabeled Organic Chemistry. That idea was debunked centuries ago, but label lives on. Life as we know it means carbon compounds, but carbon compounds do not mean life.

Some meteors from Mars carry collections of carbon-bearing compounds comparable to those Curiosity discovered on Mars. Close examination of those Mars rocks finds build ups of organics close to catalytic inclusions. The researchers hypothesize these carbon-rich deposits could have formed by electrochemical or catalytic inclusion of carbon from the planet's carbon dioxide atmosphere. No biological processes required.

The initial NASA reports compared the composition of Curiosity's organic deposits to that of kerosene. That would be consistent with them being the residue of a natural gas lake—like the ones on Titan today.

November 7, 2018

Jupiter has more asteroids than the asteroid belt. The giant planet has sixty-seven moons (and counting) and more than seven thousand trapped asteroids.

The gravity around any two objects combines in a complicated way. Five special points track the two bodies as they whirl around each other. One at 10 o'clock and another at 2 o'clock are stable. At special spots in those directions, centrifugal forces balance the combined forces of gravity, and objects there rotate with the rest.

Every set of two bodies carries similar potential wells—larger ones in proportion. Two faint dust clouds accompany the Earth and its moon. There's more debris at the sweet spots of the Earth/sun pair. The behemoths of the solar system—Jupiter and the sun—have trapped a lot more. Jupiter cleared its path around the sun long ago. Interlopers that wandered onto its track were either consumed by the planet or captured in one of its two stable spots. Over seven thousand objects large enough to be detected from Earth—many large enough to merit names—have been swept up and now orbit with the planet/sun system.

Recent human missions have explored asteroids in the belt between the inner and outer planets. The next step outward will explore Jupiter's asteroids. NASA's Lucy mission has been approved to investigate Jupiter's trailing asteroids—the so-called Trojan asteroids at 10 o'clock. (The 2 o'clock asteroids are the Greek asteroids. Objects in the two clouds are named for legends from the siege of Troy.) Proposed for launch in 2021, Lucy's twelve-year mission will visit one belt asteroid and then eight Trojans.

October 31, 2018

The Earth and its moon may be trailing a cloud of dust as they swing around the sun—or maybe two of them. There are two sweet spots in space that trap dust swept up as the Earth and moon coast through space. Dust clouds there—suggested in 1961 by Polish astronomer Kazimierz Kordylewski—may have been confirmed.

Physics creates these special spots in space. Around a lone body, gravity depends just on separation. Add a second object and things get complicated. Things near Earth fall to Earth. Things near the moon fall to the moon. Things may go either way in the space beyond. There are five special places where things go neither way. Two of these are the sweet spots leading and trailing the moon in its orbit around the Earth. Interplanetary debris caught in them is swept into the rotational cadence of the Earth/moon system.

Four billion years of vacuuming its path around the sun suggest a dense treasure trove of primordial debris might be found there. That might be that way if the Earth and moon were an isolated system. But they're not. There's the sun. Every time one of the dust clouds swings around to the sun side, its strong gravity distorts local gravity and the sweet spot leaks. Only a wisp remains. Advanced optical techniques are thought to have detected the Kordylewski clouds a quarter-million miles away—right where they were expected.

October 24, 2018

Drugged driving is as dangerous as drunk driving. Alcohol kills tens of thousands on the highway every year. Its toll in injuries and inconvenience is far higher. Narcotics behind the wheel have a comparable result. Statistics on just how big the effect is haven't been compiled until now. Alcohol is a single drug; tests for alcohol levels are easy to administer. There are dozens of illegal drugs in use today; tests for the range of drugs are more complicated and seldom administered. Without testing, drivers' Miranda rights produce an underestimate of the frequency of drug involvement in traffic accidents.

Legalization of marijuana demonstrates drugged driving effects. Drivers high on illegal drugs have always caused an unknown fraction of traffic accidents. More people are driving under the influence of the now legal drug marijuana, and they are having more accidents. Statistics demonstrate the increase—just the tip of the iceberg. Pot has been legal in Colorado, Oregon, and Washington long enough for reliable data. The National Transportation Safety Board and the Insurance Institute for Highway Safety both report a 6% increase in traffic accidents in those states since they legalized marijuana.

If the increase is 6%, how big is the total? We need better tests to find out—and stricter law enforcement to counter it.

October 17, 2018

Stem cells are living up to expectations. They are just part of the genetic engineering revolution in medicine. Progress is happening on many fronts—from the lab to the operating room.

Modified immune cells are attacking hard cancers. Specialized professionals have achieved successes at considerable expense. The time and resources required limit their extension to clinical application. A cancer victim's immune cells are extracted and custom-tailored in the lab Months later, altered cells are returned to the victim. They kill cancer cells faster than the body's immune system kills them. Successful cures suggest a promising direction for future research and development. Medical researchers are exploring avenues to extend this curative potential to a broader audience. One approach—expected to enter clinical trials in 2019—will mass produce cancer killer immune cells from stem cells. It is hoped these stem cell derived agents will survive the body's immune response long enough to attack cancer.

In another new development, Johns Hopkins researchers have induced stem cells to grow into tiny retinas. Degeneration of the retina is among the leading causes of blindness among the aged. This may or may not be a step toward reversing macular degeneration. At the least, it offers a laboratory model for testing potential treatments of this important malady.

Stem cell research proceeds on many fronts. Personally, I'm waiting for the day when an injection in my jawbone plants the seed for a new tooth.

October 10, 2018

Life was not always possible on planet Earth. In the beginning, an interstellar cloud collapsed into a hydrogen gas ball with leftover bits and pieces orbiting it. The debris became the planets. Gravity crushed the big blob in the center. Pressures and temperatures there increased until that they ignited fusion of the hydrogen. That ball of hydrogen sprung to life—lighting the surrounding bodies.

First light wasn't strong enough to support liquid water on the surface of Earth. The planet was a cold barren rock for the first billion years. Liquid water could only exist there under a thick ice crust—as it does today in Antarctica and on some moons of Jupiter and Saturn. In those early days, only Venus would have had conditions conducive to retention of liquid water.

As its nuclear fires burned, the sun compressed, and its fires got hotter. Venus fried and Earth warmed enough for liquid oceans and lakes. Life sprang up in volcanic vents and inhabited the planet. Enjoy it while you can. The sun continues to warm and in another billion years or so, Earth will become too hot for liquid water—and we will all boil away.

The so-called Goldilocks Zone—where temperatures are just right for liquid water—continues to expand. Venus was once in it. Earth is now in it. The time for Mars is yet to come. The liquids that once flowed on Mars could not have been free-standing water. Either, they were liquid water beneath miles of ice, or they were liquid methane.

October 3, 2018

Laser technology is unlocking the hidden history of the Americas. The birth of civilization in the western hemisphere was lost in the shameful fires that burned the literature of a civilization. Only hieroglyphics etched in stone remain from three millennia of native American culture. Their once fertile lands have been reclaimed by impenetrable jungle growth.

Airborne laser technology is stripping away the jungles and revealing the remnants of a sophisticated society beneath it. Laser pulses that pass through vegetation bounce off harder surfaces beneath. Returned reflections map the area below. It's echolocation as in radar or sonar or bat navigation.

Lidar mapping of the jungles of Guatemala are revolutionizing archeology of the Americas. A recent study found 61,000 rock or adobe structures in an area not much larger than Los Angeles. An estimated three to four times the population of Los Angeles lived there. The occupants depended on surprisingly modern farms supported by complex irrigation systems. Weeds have repossessed those fertile fields.

Twenty-first-century technology may yet help reveal secrets suppressed by fifteenth-century ignorance.

September 26, 2018

Aspirin is not the panacea after all. Clinical tests of heart attack and stroke victims show aspirin reduces their risk of further heart issues. A low dose aspirin regime has been widely recommended for everyone—just in case. Recent trials in healthy adults find no such benefits for the general population. In fact, a slightly higher death rate is found with aspirin.

Aspirin thins the blood and inhibits clotting. Clots formed within the circulatory system may break loose and end up blocking blood flow to essential organs. When they end up in the wrong place at the wrong time, they cause heart attacks or strokes. People who have experienced clotting problems in the past benefit from aspirin's effects. Their rate of repeat coronary incidents is reduced. They live longer.

Aspirin may reduce internal clotting for the general population; however, there are offsetting effects. An investigation following almost twenty thousand seniors for nearly five years questions the overall benefits of a low dose aspirin regime. The study—published in the New England Journal of Medicine—finds that aspirin increases the occurrence of internal bleeding in the brain and in the bowels. The net effect is higher mortality among healthy seniors taking aspirin regularly.

September 19, 2018

Asteroids are antiques. They're the leftovers from the formation of the solar system—unchanged throughout time. Want to know how it all started? We could send a chemist to analyze one. The trip would take years. A robot chemist would be better. Robot chemists don't ask for a ride home. A robot miner would be better still. It could scoop up samples and carry them back to Earth labs. The Japanese probe Hayabusa did just that.

Hayabusa rendezvoused with a nearby asteroid named Itokawa, surveyed it, and returned a thousand microscopic samples to Earth. Exhaustive tests and analyses revealed details beyond the miracles performed on television's CSI show. The asteroid was born 4.6 billion years ago—about the same time as everything else in our solar system. It was involved in an collision 1one or two billion years ago, and recently migrated from the asteroid belt.

The Japanese Space Agency followed this success up with Hayabusa2 which reached a bigger asteroid Ryugu this summer. It will land there and collect more specimens for return to Earth laboratories in 2020. The USA probe Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer (OSIRIS-REx) is closing in on yet another near-Earth asteroid, Bennu. It will return its specimens in 2023. These missions will teach us a lot about near-Earth asteroids. Extension to bodies in the Asteroid Belt beyond Mars is not on anyone's drawing board yet.

September 12, 2018

Reports of coral's death have been greatly exaggerated. Ocean warming and ocean pollution have bleached coral reefs around the world, but bleaching isn't necessarily death. Coral is an animal that builds a limestone burrow around itself. Generations build on the remains of their ancestors, and huge colonies become the familiar coral reefs.

Animals have to eat, so coral nurture algae. These brightly colored zooxanthellae algae capture energy from the sun and photosynthesize the nutrients that feed their coral hosts. Zooxanthellae are sensitive plants that leave when the local temperature, chemistry, or lighting are not just right. Their departure leaves naked coral trapped in their white limestone caves. Hunger and then starvation ensue. The strongest survive awaiting the return of the algae.

Coral have endured ocean climate variations over hundreds of millions of years. Recovery of the world's largest coral reef has already begun. An estimated thirty percent of Australia's Great Barrier Reef suffered bleaching in the 2016-2017 summer heat. The Reef & Rainforest Research Centre reports the reef shows "substantial signs of recovery" after a milder 2017-2018 summer.

September 5, 2018

Today's simple climate models cannot explain "the year without a summer." Eruption of Indonesia's super-volcano Mount Tambora on April 10, 1815 led to heavy rains worldwide. 1816—the year without a summer—followed. Crops failed. Farms were abandoned. Famine drove migration to warmer regions. Eruption of the nearby volcano Krakatoa on August 27, 1883 did not alter global climate. The two events seemed similar. Both shattered 2.5 cubic miles of mountain—a hundred million billion tons of rock—and spewed the debris into the atmosphere from about the same location. The difference in their climatic effects was profound. Recent analyses have finally suggested an explanation for the disparity between the two.

The explosive force of an eruption shatters the volcano's rock cone. Shards as big as Buicks and shards smaller than a spec of dust are hurled out in a stream of super heated gas. The plume rises and spreads until it hits an inversion layer in the atmosphere above. What we see of the volcanic cloud is trapped there. It spreads out through the stratosphere.

Volcanic plumes are electrically charged. The explosive shearing of the volcanic structure happens faster than electricity can relax. Positive gases are ejected carrying negatively charged particles with them. Violent lightning storms accompany the plumes. Charge is neutralized via discharge and collision, but is far from complete during plume rise.

Recent calculations by Mathew Genge (Geology, 21 August 2018) show the inversion layer may not corral the smallest particles in the plume. The attraction of the ionosphere's positive charge balances gravity and aerodynamic drag on the smallest fragments. Charged shards of a few hundred thousand atoms are electrically levitated into the ionosphere. That's where clouds form. A temporary excess of nucleation sites makes more clouds, and those make more rain. As the negatively-charged fragments spread out, they neutralize the region's natural positively-charged ions. Genge calculates that a mere five hundred tons of injected debris would be enough to short circuit the upper atmosphere. That would have profound effects on the weather until the sun's ultraviolet radiation restored normal conditions. It might be enough to cause a "year without a summer."

August 29, 2018

Krakatoa erupted 135 years ago this week. On August 27, 1883, the Indonesian volcano rumbled to a crescendo with the force of ten thousand atom bombs. The explosion tore the island apart and blew 2.5 cubic miles of debris into the atmosphere--about a hundred billion tons of dust. Its cloud spread around the globe and colored sunsets for years after. It did not affect the weather.

Years before, the eruption of Indonesian Mount Tambora on April 10, 1815, had produced the "year without a summer." That explosion was an estimated ten times more energetic than Krakatoa. It shattered the mountain and lofted a comparable amount of dust and debris into the atmosphere. Mount Tambora's clouds blocked enough sunlight to drop temperatures around the globe. Summer snows were symptomatic. Crops failed across the northern hemisphere. Farms failed. Famine was widespread.

What was the difference? Why were Mount Tambora's effects so much different from Krakatoa's? Climate models should contain the answers. Years ago—when I reviewed early climate models for the Defense Department—I challenged the modelers to account for these different effects. We have worldwide weather data for both events.

Today, climate model predictions have gone from a new ice age to global warming, and now to the noncommittal climate change. None have been able to meet the test and differentiate between the effects of Mount Tambora and Krakatoa.

Why should we mortgage our future based on models that can't explain the past?

August 22, 2018

The sky is full of surprises. The harder we look, the more wonders we see. This week, astronomers announced the discovery of a strange object out there. Too big to be a planet and too small to be a star, it is on the borderline between the two. It glows as hot as an electric range. It shouldn't. Not big enough to ignite nuclear fusion, its heat source is unknown. Intense radio emissions indicate a strong magnetic field and bright aurorae. Those arise from magnetic fields accelerating charged particles into the poles. Where those particles come from is a mystery—one of many.

This object is a rouge planet twenty light-years away: a lone body accompanied by nothing. Rogues are hard to detect, but they're probably not uncommon. They're the debris from thirteen billon years of cosmic collisions. When stars pass within a light-year or so of each other, their orbiting debris clouds are jostled. Outlying objects are most affected. Planetary orbits are torqued. Far-flung swarms of asteroids and proto-planets are siphoned off or kicked out. Ejected bodies become rogues roaming the universe. Most cool to the ambient temperature of interstellar space—near absolute zero. A few larger rogues may have internal heat sources that keep their interiors above ambient. The high temperature of the newest rogue planet is abnormal. Is it a nuclear reaction we don't understand? Most become invisible against the background of space until they get

close .

The recent encounter with the rogue asteroid Oumaumau may be typical. The giant rock appeared out of nowhere headed toward the sun. We watched it accelerate through the plane of the planets, turn, and fly back into oblivion. Oumaumau is probably representative of the cold dark wreckage filling interstellar space. There's thirteen billion years worth of it out there.

August 15, 2018

Methicillin-Resistant Staphylococcus Aureus (MRSA) has escaped the hospitals and set healthcare back a hundred years. MRSA makes a twenty-first-century infection about as dangerous as its nineteenth-century predecessors. Before penicillin, Staphylococcus Aureus (staph) caused incurable infections ranging from itchy to fatal. Along came penicillin and staph became a nonproblem. One dose killed 99% of the staph germs, and the infection went away. Only the strongest 1% of the bacteria survived. Those went on to infect again, only to be almost wiped out once more. Soon, the surviving staph germs became immune to the effects of penicillin—the drug had killed off the rest. Other antibiotics worked for a while, but resistance to those evolved too. Through the hundred thousand germ generations since penicillin, staph has developed immunity to all known antibiotics.

The Centers for Disease Control and Prevention calls MRSA infection the most serious cause of infectious disease in the United States. They report tens of thousands of human fatalities every year. Nobody is counting nonhuman deaths, but the San Diego Zoo lost a baby elephant to MRSA a few years ago.

Those bacteria are everywhere. We come in contact with them every day. Our skin protects us from them—as long as it remains intact. A break in the skin invites staph in. Open sores turn into stubborn infections. Those require months-long medical care or surgery. Staph bacteria that reach the bloodstream attack internal organs with frequently fatal results. Medical and dental professionals exercise extreme care to prevent infection in invasive procedures. Others may not be so conscientious. Tattoo parlors and piercing emporiums look nothing like operating rooms. Intravenous drug users are notoriously unsanitary, and MRSA infection of their heart valves kills twenty thousand of them every year. (That's comparable to their sixty thousand annual overdose death rate.)

There's no cure for MRSA infections. The search for new antibiotics goes on—with the hope of a respite from the staph epidemic. A University of Iowa study has identified a staph secretion that may be responsible for some of its most devastating effects. Staph attacks the circulatory system, especially the valves and linings of the heart. Until we can cure MRSA infection, we can try to block its most severe effects. The Iowa study results may point the way.

August 8, 2018

Robots are the future. Competitions like those organized by RoboNation are bringing the future to us today. Last week, they held their twenty-first annual RoboSub competition for autonomous underwater vehicles. Forty-seven student engineer teams from ten countries created robot submarines to perform tasks simulating actual underwater work for Navy and industrial applications. They sought objects, retrieved objects from the bottom, deposited them to a target location, and more. All without human intervention.

Innovation was everywhere at the event. Student engineers explored ways for their robots to figure out where they were, and to decide which challenges to attempt. There's more than one way to snatch something moving around in the turbulence of your own thrusters. Everything from a claw to a simple stick was used to flip a switch. The teams were proud of their inventions. Engineering crosstalk means next year's student robots will be even more sophisticated.

Everyone came away a winner. Building a robot submarine this complex is an accomplishment to be proud of. The teams who made it to Sunday's final round were some of the world's leading schools. They were

California Institute of Technology

Cornell University

École de Technologie Supérieure from Canada

Far Eastern Federal University from Vladivostok, Russia

Harbin Engineering University from China

Maritime State University from Vladivostok, Russia

National University of Singapore

San Diego Robotics 101

Sunday's podcast of the final round of competition was viewed by academics, alumni, and engineering hiring managers world-wide. We were not disappointed.

The judges named Harbin Engineering University the winner for 2018. They and the forty-six other teams can be proud of what they did this year. They'll spend the coming year upgrading their designs and come back better than ever in 2019.

August 1, 2018

#MethaneOnMars

Again this week, the news media announced there's water on Mars. Radar data suggested there's a lake a mile below the planet's south pole. Ground penetrating radar saw reflection off a smooth surface there. An underground lake would look like that.

The reports assume that this is a lake filled with liquid water like the ones under Earth's own south pole. The radar data neither support nor refute the asumption that the lake is filed with liquid water. Radar can't identify materials. Deep down beneath the Mars south pole, it's cold, so water would have to be really salty to remain liquid there. Briny water is what is being reported.

Mars's lakes needn't be water lakes. There's evidence that liquids once flowed on the surface of Mars. What that liquid was is not clear. Mars has never been in the Goldilocks zone for liquid water. That's where it's neither too hot nor too cold. Like her poridge, the temperature must be just right for liquid water. Mars's lakes could be methane lakes, like those of Jupiter's moon Titan. Mars has been in the Goldilocks zone for liquid methane. The surface of Mars may have been more like Jupiter's moon Titan than like Earth. Residues of methane lakes could lie buried under the Martian surface. At the temperature and pressure under a mile of Martian rock, methane is liquid with or without dissolved contaminants. The Martian water in this week's news may turn out to be liquefied natural gas.

July 25, 2018

Jupiter's Technicolor moon Io is a land of fire and brimstone. That moon—just a bit bigger than our own moon—has over 400 volcanoes. About 150 of them are active at any given time. All that lava spreads out and repaves the planet surface, so Io has few or the visible impact craters that other moons do. The volcanoes spew giant plumes plus lava, molten iron and sulfur. Sulfur and its compounds come in vivid colors. The element itself may be red or yellow. Its oxides come in several different colors. One familiar iron sulfide is "fool's gold." Vast surface deposits of these minerals give Io its brilliant colors.

Io is hell. It is nestled deep inside Jupiter's radiation belt. Humans and their probes can't survive long in that environment. Only the most advanced telescopes can image Io. It has been photographed from afar by deep space missions picking up a gravity boost on their way past Jupiter. It's just a target of opportunity when the Juno probe swoops in for close ups of Jupiter.

The data to date show hell is an exotic place. The gravity of Jupiter and two nearby moons create phenomenal tides there. Hundred foot tall waves propagate through the solid crust of this moon. (Solids do flow under enough pressure. Chocolate bars sag on a summer afternoon. Window glass droops over centuries.) The friction of these tides heats the interior to melting. The core is liquid—possibly liquid iron like Earth's center. Gravity's pulling and tearing stresses the solid surface. When it fractures, some fragments are subducted into the liquid core. Others are twisted in Himalayan-scale mountain ranges. Studying Io's extreme geology will help us better understand our own planet.

July 18. 2018

Apollo 11 landed on the moon forty-nine years ago Friday, July 20. Everyone who has ever received a letter from AARP remembers where he or she was that day. We were all biting our nails as we watched the moonscape flash past the Lunar Module window. Boulders and debris: the terrain looked rough. Could they land there? The nation breathed a collective sigh of relief when the Eagle landed. (Years later, we learned the descent engine was running on fumes. The mission was only seconds from abort.)

Then the world waited while the astronauts did a few housekeeping chores and ate lunch. They scrubbed the four-hour nap NASA had scheduled for them, suited up, and stepped out to the moon. An outside camera showed Neil Armstrong step cautiously down the ladder. Finally, he took "one small step for [a] man, one giant leap for mankind." Would the moon be sand or quicksand or bedrock? It supported his weight. He grabbed a contingency sample just in case, and stepped away.

Man's first visit to the moon would be brief. It was the victory lap in the Space Race with the Russians. The two astronauts planted the American flag, and received congratulations from President Nixon. They collected rocks and soil samples, and fielded science experiments—some of which are still functional today. After less than a day, they blasted off for home.

Their ride back orbited overhead. Space vehicles had docked in Earth orbit before, but never in lunar orbit. National nail biting continued until the two ships locked together. The astronauts and their samples were moved to the Command Module for the trip home. They jettisoned the Lunar Module. All that was left was one engine burn. It would take them out of lunar orbit and put them on the homebound trajectory. That burn would occur on the far side of the moon. The ship popped out from behind the moon on course, and the world breathed easier, Earth orbit was guaranteed.

The drama was over. Descent from orbit was old hat, so the public wasn't concerned. Landing in the Pacific Ocean went almost flawlessly. The astronauts were recovered, wrapped in bio containment suits and quarantined for two weeks. The Apollo 11 craft was bleached to kill any alien plagues that might have hitched a ride to Earth. All went well with parades and honors. A few longer moon missions followed—and then the world forgot Apollo.

Humans are going back after a fifty-year hiatus. Robots and probes from a half dozen nations are paving the way. SpaceX has sold two tickets for a tourist loop around the moon. NASA will put Americans back on the moon within five years. They may meet astronauts from China and other countries when they get there, GoogleMoon has mapped every nook and cranny of the place. FedEx is planning deliveries as soon as there's someone there to sign for a package.

July 11, 2018

Can man follow his robots to Mars? The mission is dangerous and tedious. Weightlessness causes loss of muscle tone. Six months of it can be crippling. Astronauts often return from the International Space Station in wheelchairs. The Mars team must step off their lander unaided after eight months of zero gravity. The beginnings of radiation sickness will compound the effects of atrophied muscles. Still, they'll be happy to escape from eight boring months inside a Greyhound bus size space vehicle. Mission simulations indicate that crowded conditions there will create high levels of stress. Research is seeking ways to reduce the physical and mental challenges of the voyage.

Getting to Mars is only the beginning. Human subjects have been exposed to conditions simulating the full Mars mission. The trip is eight boring months in a tiny vehicle getting there, then eight months camped in a desolate Martian desert, and finally back onto the bus for the dreary eight-month ride home. Radiation exposure continues to accumulate until the return to Earth. The effect of Mars's reduced gravity is unknown. Will the effects of weightlessness be reversed or will they only slow under it? Will bone mass loss compound muscle mass loss? Mission simulations show the psychological issues continue to grow as time moves on. Watch jealousies and personalities explode in Stranded on Mars.

The astronaut is the one mission component that cannot be reengineered. Hardware development for the rest of the expedition continues on the ground and in near-Earth orbit. It must be tested in space before launch to the red planet. The moon offers the ideal test bed for that. Both the moon and the planet have low gravity and no atmosphere to speak of. Both are bathed in intense radiation and suffer frequent meteor strikes. The two have limited natural resources and little water. A moon base would be almost local test site by comparison—a quarter million miles vs. a quarter billion.

Robots will prefabricate the Mars colony before astronauts arrive. The prototype construction robots should be debugged on the moon first. Build a model city there, and then an engineering test lab. When the robots' work is done, staff the outpost with human test engineers, and send them the Mars mission equipment to investigate.

This would be the dream "overseas assignment" for an aerospace engineer. They'd feel right at home there. FedEx is already planning to provide service to the moon base.

July 4, 2018

The ocean has a climate all its own. The sun drives both the atmospheric and oceanic climates. Solar heating is concentrated near the planet's midsection—between the Tropic of Cancer and the Tropic of Capricorn. Hot water floats on top of cold. Winds push the warm water toward the poles. The rotation of the earth twists ocean flows into great arcs—clockwise in the northern hemisphere and counterclockwise in the southern hemisphere. These warm streams dominate the climates of the sea and the land around it.

Just as air streams like the familiar Jet Stream spin off the swirling local disturbances we call weather, the ocean's main streams spin off eddies of their own. Cold-water whirls rise from the depths, and warm water swirls descend into them. These are analogous to the low- and high-pressure centers seen on weather maps. Both kinds of ocean eddies span hundreds to thousand of miles and persist for months.

Creatures of the sea have evolved to live in them. Rising whirlpools carry nutrients up from the bottom. Cold water dissolves more oxygen and carbon dioxide than warm water can. Photo plankton and the food chain based on plankton thrive in the cold-water flows. Life is different in the warm-water vortexes. Carbon dioxide shortage limits photosynthesis and thus the rest of the food chain. Despite that and a general oxygen deficiency, alpha predators stalk the depths of warm water whirlpools. There must be plenty of prey there. A three thousand pound fish does not exist on sardines alone.

Great white sharks migrate to warmth. Six years of tracking two adult great white sharks finds they frequent warm areas near shore and in the open ocean. Food is more abundant in colder waters, but these sharks and other predators show a strong preference for warmer areas. Shark experts suggest this may be the result of the shark's need to maintain its body temperature. Great white sharks are warm-blooded animals. In the open ocean, they dive a quarter mile down to hunt, and can stay longer where they don't lose heat as fast.

Two thirds of the earth's surface remains unexplored. Our oceans are more alien than the moon or Mars. It's a fascinating place. There may be primitive life all over the solar system, but our oceans contain the only other intelligent life for light years around. Meet another Earthling in Fish Story.

June 27, 2018

An asteroid—bigger than an SUV—exploded in the sky south of Moscow last week. The superheated rock erupted in a brilliant flash and trailed smoke and debris for miles. That was a relatively minor event. Five years before, an asteroid as big as a couple of diesel locomotives shattered a Russian city. The largest asteroid impact in recent history flattened an area in Siberia larger than Los Angeles, London, or Moscow. Long ago, a mountain-size asteroid may have triggered the dinosaur die off.

The sky has been falling since before the Earth cooled. As our parent interstellar cloud collapsed to form our sun, wisps of leftovers condensed into bits and pieces around it. Those began to coalesce into planets, moons and more. The planet-building process continues to this day. Asteroids and comets swarm the universe, flying hither and yon until they hit something—anything. They may shatter or scatter or fuse. Meteors hit the Earth every day. The next big one may hit tomorrow, or it may hit in a hundred thousand years. We don't know.

Scientists are searching the sky for potential asteroid hazards. Nearly twenty thousand have been cataloged so far. NASA posts warnings when a large one will pass closer than the moon. Things swinging around the sun and coming back at us are harder to predict. Extra-solar objects like Oumuamua are beyond the state of the art. No apocalypse-scale asteroid collisions are on the horizon … yet.

What could we do if we saw the big one coming? Whatever it was would take years to prepare—longer if the government procurement cycle was required, longer still if an international effort were mounted. That much time wouldn't be available. Predicting the intruder's trajectory years ahead of time would be too uncertain to justify the expense entailed. Whatever response was selected, it would not be a manned expedition—that's Hollywood. Robots work better and they don't expect a ride home. A few nuclear detonations properly placed might alter the trajectory enough to buy a near miss. Smithereens are out of the question. Intersecting alien intruders at interplanetary standoff distances is the stuff of video games. So are lasers delivering enough energy to deflect a heavyweight asteroid. The only technically feasible response to an apocalypse asteroid is to evacuate the target area.

June 20, 2018

It's ugly out there today…on Mars. A dust storm has enveloped a quarter of the planet. Martian storms are natural disasters so huge they're visible from orbit. Satellites have watched storms lie these grow as big as Texas and even planet-wide in scale. Severe Weather like this is a hazard encountered by every Martian explorer in contemporary science fiction. My latest novel Stranded on Mars is no exception. Zero visibility may be hazardous to your health.

The facts of the planet's climate are not yet understood. What causes these storms? Martian summer is beginning. Dry ice frost is subliming—passing directly from solid to vapor. (There is no liquid carbon dioxide on Mars.) How do winds of such a wimpy atmosphere raise enough haze to block the sun and create zero visibility? Could it be like the Oklahoma dust bowl of the 1930's? There, extreme drought dried the soil so much that it no longer clumped together. Winds lofted unbound grains of soil. Mars is far drier than Oklahoma at its worst.

Martian weather forecasting is a long way off. Satellites will track current dust storms as they develop. Further details may be available from Opportunity the robot rover trapped in the middle of the current storm…if it survives. The robot is solar powered, but it's pitch dark inside the storm clouds. NASA has put it into hibernation in hopes of preserving enough battery power that it can awaken after the storm passes. We don't know how long it will have to sleep or whether its batteries will freeze solid in the interim. It's not known how much damage blowing Martian debris may inflict on it. Martian dust is not like than Earth dust. Martian sand grains are electrically charged and have sharp edges. Opportunity may be struck by lightning during the storm. Tiny specks hitting seventy mile per hour chunks may sandblast its optics. Its joints may be filled with grit, and its solar cells covered with crude. (Here or there: dirty solar panels don't work well.) If Opportunity recovers, it will be our "boots on the ground" reporter. We'll be one step closer to protecting future astronauts and colonists from Martian Mother Nature.

June 13, 2018

Suicide is a sad fad. The Centers for Disease Control and Prevention report a steady rise in suicide deaths over the past twenty years. This reflects either a disturbing fashion trend or relaxed reluctance in reporting. Has suicide's stigma worn off?

This week, Kate Spade and Anthony Bourdain, two minor celebrities killed themselves. They both made the front page for the first and last time. Few people had heard of either one before, and only their families will remember them after next week. Nevertheless, watch for copycat suicides by people wanting their own fifteen minutes of fame—just like the stars. Suicide rates jumped 10% in the months following reports of Robin Williams' suicide.

Suicide happens too often. Suicide deaths outnumber traffic fatalities or opioid overdose deaths. Three quarters of American gun deaths are suicides. Women tend to choose poison instead. Others hang themselves, slash their wrists, or jump off high places. Stepping in front of fast-moving trains is the latest fad in my neighborhood. That gets you only local news coverage around here. For real notoriety, point a gun at a cop. Your death sparks demonstrations about "wrongful death" and "police brutality." Do those wrong-way freeway drivers really cause traffic accidents? Or are those incidents murder/suicides?

Just because Billy Joe McAllister jumped off the Tallahassee Bridge doesn't mean you should too. We're losing twenty-two veterans every day—responsible young men and women with a lot more to contribute to our country. Suicide is the wrong answer. Lonely? Depressed? Know someone who feels that way? Friends and professional help may keep some from hurting themselves and their loved ones. The suicide hotline 1-800-273-8255 is the first step away from harm.

June 6, 2018

Telescopes and computers are beginning to unveil a universe stranger than science fiction. Once upon a time, the moon and a handful of planets orbited our flat Earth. Heretics who suggested otherwise were burned at the stake. Not so long ago, there were nine planets—including Pluto—and a gaggle of moons. Then came the first planet beyond our solar system; the first ten; the first hundred. There are thousands known already, and the number keeps growing.

Today, computers do the repetitive work to explore the sky. The tedium of finding Pluto was heroic. Computers don't get bored. They can stare at reams of data looking for the subtlest variations. The first extra-solar planets were discovered by a tail-wags-the-dog effect on a star's spectra. (A star wobbles as its planet spin around it. The stagger in its step tells us it has planets.) More have been detected by a star's slight dimming when a planet crosses between the star and us. NASA's Kepler probe watched a small swatch of sky and found thousands of planets close by. Its successor TESS will survey a much wider expanse. It should find many more. There are an estimated ten billion planets in our Milky Way Galaxy alone, and a hundred billion billion more planets throughout the cosmos.

Tomorrow's telescopes will tell us even more about the worlds out there. The Webb telescope will discover planets beyond those we've seen so far. The next generation telescopes may able to image and study the planets around nearby stars. Don't expect maps like GoogleMoon or GoogleMars just yet. Do look for answers to fundamental questions.

· Which ones have moons.

· Which planets or moons have liquid water?

· Which have atmospheres? Water vapor can be detected in the infrared; nitrogen, oxygen, and carbon dioxide can't. Radiation or electric storms may generate auroras. Active volcanoes may spew detectable materials into the planet's atmosphere.

· Which planets or moons are candidates for extraterrestrial life? Liquid water and comfortable temperatures suggest a possibility of life as we know it.

Actually detecting life there, intelligent or not, is beyond the realm of foreseeable technology. We'll have to join the Search for ExtraTerestrial Intelligence (SETI) in waiting for them to contact us with a big neon sign saying HI MOM.

May 30, 2018

Mars: getting there is the easy part. NASA is landing heavier and heavier robots on the surface. SpaceX is soft landing and reusing the massive first stage of its Falcon 9 rocket on Earth. If they can land something that heavy here, they'll be able to do the same thing on Mars soon. SpaceX is already pitching tickets to Mars colonists. Those Mars tickets are one-way tickets though. SpaceX doesn't offer a ride home. The way back is an engineering, economic, and medical nightmare all its own.

A manned round trip to Mars weighs more than we can loft. Such a trip would have to be launched in stages. All hardware components for the return trip would be preplaced before the astronauts even left Earth. That equipment would have to work perfectly after enduring years of extreme cold and intense radiation. Stranded on Mars describes the consequences of failure. (Remember, there was no Plan B for the Apollo astronauts.)

The first step home would be launch into orbit. Lifting a crew off the planet requires something like a Cape Canaveral launch…without the thousand NASA support engineers back home. They're a twenty-minute communication delay away. The Mars evacuees are on their own.

Mars is smaller than Earth. Its gravity is lower, but launch still requires massive amounts of propellants. The launch rocket itself would be fabricated on Earth, delivered to Mars, and landed there. NASA hopes to avoid the additional cost of shipping tons of propellants by manufacturing them on site.

Propellants store energy to move the rocket. Solar energy is the only known energy available on Mars. Sunlight there is only half what it is on Earth. Mars has limited natural resources to make propellants from. The atmosphere is carbon dioxide. There are unknown amounts of methane and water on the planet. An autonomous chemical plant could synthesize and store oxygen and methane or ethane for the launch. The visiting astronauts will want to know the tank is full before leaving home.

Engineering can fix every element of the Mars mission except one. Astronauts are not easily modified to accommodate radiation or weightlessness. Radiation monitors accompanying Mars robot expeditions show that a single round trip exceeds the recommended lifetime human exposure to radiation. Astronaut muscles atrophy under weightless conditions. Six months of it can be crippling. No one can predict the effect of eight months getting there, a year of one-third gravity on the ground, plus eight months coming back. Robots don't complain about little things like that, and they don't demand a ride home. It's not time to send a man to do a robot's job…yet.

May 23, 2018

We search for intelligent life light-years away, but overlook our own oceans. Intelligence has sprung up all over the world. We'll find it everywhere if we just look with open minds. It's not just our ape cousins or our household pets either. Exotic species like squid and octopus seem to be as smart as our dogs and cats. Humans need to be able to deal with the range of intelligent Earthlings before encountering the even greater variety expected in extraterrestrial intelligence.

Octopus and squid are nothing like people. Their intelligence is as alien as their physique. Legends of their problem solving abound. Octopuses poach from adjacent tanks in captivity and escape secure lab facilities. Squid hunt in packs. That kind of coordination requires communication. Humboldt squid change color quickly. When hunting, they flash red and white so fast they seem to be telegraphing each other. Other colors for other circumstances suggest a larger vocabulary in a language of colors. That would be a viable alternative to humans' spoken word for an intelligent animal.

Our intelligent neighbors live in a world unlike our own. Humboldt squid spend their days lingering at oxygen-depleted depths—probably feeding on whatever they find there. At night, they rise to the surface to hunt. Swarms of squid attack schools of fish. Bite-size ones are consumed on the spot. Larger prey may be dragged back down to the oxygen minimum zone to suffocate. Fellow squid may be injured in the violence, and are often eaten along with the quarry. Anything wandering into squid feeding frenzies is attacked. YouTube videos show man-size squid mobbing human divers who got too close.

Extraterrestrials have two arms, two legs and one head in the movies. Expect greater variety in reality. Present day intelligent Earthlings are just a small sampling of what we may eventually encounter in the universe. Even those don't always fit the humanoid mold. Squid intelligence may continue to evolve here on Earth, and may already have gone far beyond on other planets. The science fiction novel Dead Astronauts describes squid-like aliens from an ocean-covered planet. When we encounter intelligent extraterrestrials, they won't be "as seen on television."

May 16, 2018

San Diego will put the FAST in fast food. Uber will explore food delivery by drone here. It's part of a Department of Transportation test of commercial drones. Uber is also testing driverless cars on San Diego streets, and plans to introduce flying taxis in five years. The city has been selected as one of several test beds for commercial drones.

There's more to commercial drones than just Thirty minutes or it's free. San Diego organizations will explore applications to improve the health and safety of the area. UCSD Health will be part of a team looking at drones rushing medical test specimens to laboratories. Sister cities will look at delivering blood, drugs or defibrillators where they're needed. GE and the City of San Diego will develop applications to upgrade infrastructure management. Their drones may even seek out open parking places—a potential quality of life benefit. A critical element of the Department of Transportation study will be avoiding drone interference with civilian and military aviation in the greater San Diego area.

In three years time, the Federal Aviation Administration can look forward to a blueprint for regulating commercial drone traffic in cities everywhere. San Diegans can look forward to warmer delivery pizza, faster turnaround at clinics, and maybe a parking place. Legitimate businesses can look forward to catching up with the Mexican cartels, which have been flying narcotics across the border for years.

Applications to public safety will not be overlooked. Law enforcement agencies are developing surveillance drones to supplement manned aerial platforms. AT&T will develop remote observers to help focus emergency response. Qualcomm, AT&T, and GE will look at monitoring incursions crossing the border with Mexico … or flying over it

In three years time, the engineering will be largely done, and the legal hassles just begun.

May 9, 2018

Insight, a robot geologist is on its way to Mars. It will sleep through the six-month journey and wake up ready to explore. Orbiting satellites have mapped the planet. Insight's robot predecessors have roamed the surface. This one will burrow into the ground beneath it. There, it will field instruments up to sixteen feet deep to monitor the flow of heat from the interior of Mars. A companion motion sensor will detect Marsquakes and other rumbles. Mars is bombarded by meteorites. Their explosive impacts send seismic waves through the ground. Those signals and their echoes will paint a picture of the interior structure of Mars.

Understanding the planet Mars begins with its geology. That's why the commander and chief scientist of the first manned mission to Mars—in my novel—is a geologist. A human could respond to the unexpected a robot might not detect. The first human geologist won't go into suspended animation for the six-month journey—like Insight. He'll need to be kept alive and protected from interplanetary radiation the whole way. He won't chance an experimental landing technique like the one Insight will use. He'll need a lot more than just a few square meters of solar panels to survive and function. Last, but not least, he'll demand a ride home. That's something Insight isn't getting. That's the failure that leaves the crew of my Mars 1 expedition Stranded on Mars

The more we learn about our sister planets—their similarities and their differences—the better we can understand our own. The rocky planets of the inner solar system were all formed out of the same swirling debris cloud four billion years ago. Mercury turned out small, Venus hot, and Mars cold. Earth turned out just right. Earth has a strong magnetic field, the others don't. Earth has plenty of oil and water, Mars has less. Venus and Earth have volcanoes; Mars seems quiet. Why? The list goes on and on. We have a lot to learn from our neighbors.

May 2. 2018

If the drug doesn't kill you, the needle might. Opioid overdoses alone killed more than sixty thousand Americans in 2016—the most recent year tabulated by the Centers for Disease Control and Prevention. That's more than auto accidents, suicides or murders. Users surviving the overdose epidemic may die from dirty needles. Shared needles are spreading Hepatitis, AIDS and other infectious diseases through the user community.

The New York Times reports a growing problem of serious heart effects among those who inject illicit drugs. Germs introduced into the blood stream along with the drugs spread disease throughout the body. Massive levels of antibiotics combat the resulting systemic infections. Survivors carry the scars of bacterial incursion. These effects may include critical damage to the interior linings and the valves of the heart. This lethal condition, called endocarditis, requires open-heart surgery.

Endocarditis is rare in the rest of the community. The underlying infection may arise from invasive medical or dental procedures, but also from tattoos or body piercings. Some 41% of endocarditis patients survive treatment unless they are illicit drug users. Addicts return to the needles that infected them in the first place. Many suffer a second bout with the condition, and some have gone around a third time. Only 7% of the drug user patients survive ten years after their first operation. Frustrated surgeons performing these procedures are starting to demand their patients undergo drug rehab as part of their therapy.

April 25, 2018

It's raining planets. Five hundred years ago, heretics were burned at the stake for suggesting stars might have planets. A hundred years ago, most people believed there must be planets out there somewhere. Thirty years ago, the first exo-planet was detected. After that, astronomers found them by the dozen, and then by the hundred. Five years ago, NASA launched Kepler and the sky's population exploded. Kepler stared at a narrow sliver of the sky and found thousands. TESS, its successor, will scan a larger area. Tens of thousands more exo-planets are expected.

Like Kepler, TESS will search for planets blocking some light from their suns. When one crosses our line of sight, some of the starlight is obstructed. How much depends on how big the planet is; how long depends on how it orbits its star. From the size of the host, astronomers infer how big the planet is, how heavy, how hot, and more.

TESS will search for additional nearby exo-planets. Nearby is a relative term. To an astronomer, nearby is not somewhere you could travel to. Proxima B, the closet known exo-planet, is 4.2 light-years away. That's a hundred thousand year trip for the fastest man-made object yet. (My Dead Astronauts novel describes the arrival of Proximeans who traveled at one hundred times that fast. It was still a journey of a thousand years.) Visits to other nearby exo-planets will take a human lifetime at the speed of light—when we figure out how to do that. Light moves that fast; people don't.

No one has seen an actual exo-planet yet. It is hoped that the next generation of space telescope—or the one after that—will accomplish that feat. TESS results will highlight some worth trying for.

What will TESS see? What would it see if it were out there looking back at us? The mission will monitor the southern sky the first year and then the northern sky the second. If it were orbiting some exo-planet, it would watch our sun for a year. Mercury would dim the sun four times and Venus once or twice during that period. Earth would cross once. Mars would be fifty-fifty and the rest would be unlikely. They'd want to go back for a second look to be confident about the inner planets of our solar system.

If they continued studying us, what more could they see? After a while they'd notice our size varied by five percent between sightings, and decide we had a large moon. Meticulous spectroscopy would see a half percent or less effect indicating water in our atmosphere. (Oxygen, nitrogen and carbon dioxide are invisible.) That would suggest that life might be possible here. That would probably justify pointing their best space telescope in our direction. They'd see a blotchy blue-green ball. They'd interpret the blue as liquid water. They'd wonder what the green patches were.

April 18, 2018

Sarin: what's sarin? It's a lethal chemical recently used against Syrian civilians. Sarin is just one of several organophosphate compounds developed as war gases by German chemists in the 1930s. After World War II, stockpiles of German nerve agents GA through GF were discovered. None had been used in combat. Following the War, the US implemented a chemical arsenal around sarin (GB) and the USSR built one based on tabun (GD). Both stockpiles have since been destroyed.

There are a number of nerve agents known. They are modern chemical warfare agents lethal in microscopic doses. All enter the body through the lungs, or even through the skin. A couple of high profile assassination attempts have delivered nerve poisons by contact. A nerve agent spray broadcasts death over a wide area.

Once inside the body, nerve agents spread out and attack critical nerve junctions. Nerve cells pass messages along long thin tendrils called axons. One nerve cell or neuron communicates its message to the next by excreting a wisp of a chemical at their juncture. Each link contains an enzyme that captures that chemical and turns the signal off. Humans have billions of neurons controlling every function of our body. Different functions employ different signal chemicals. The autonomous nervous system that operates our heart, our lungs, and our gut signals with a chemical called acetylcholine. Normally, the enzyme acetylcholinesterase removes that chemical and switches the signal off. Nerve agents destroy that enzyme and short-circuit the body's control systems. Death or disability is quick and ugly.

Sarin is cheap and easy to make and use. That's why it's so dangerous. Simple recipes can be found in libraries and online. The ingredients are all available over the counter cheap. Crude sprayers are all that are needed to poison a target area. Primitive countries and even a few small terrorist groups have developed and used sarin.

April 11, 2018

The sky is falling.

On April 2, 2018, nearly ten tons of debris fell out of orbit and crashed into the Pacific Ocean. The Chinese space station, Tiangong-1, was an orbiting engineering test bed. Unmanned docking practice was followed by two manned missions. The experiments validated Chinese docking technology in preparation for more ambitious space missions. The old lab was left in orbit pending a controlled crash into an unpopulated area. Communication with the ground was lost before that could be completed. Tiangong-1 was left blundering uncontrolled through the sky.

Wisps of atmosphere extend all the way to Tiangong-1's near-Earth orbit altitude. Even that little bit of air exerts drag on satellites speeding through it. Tiangong-1 lugged its clunky shape—solar panels and all—through that thin air at over fifteen thousand miles an hour, so the drag slowed Tiangong-1 down. As it did, Tiangong-1 lost altitude and dropped into thicker air. That increased the drag, and the Chinese space station slowed even more.

By April 2, Tiangong-1 had dropped into air so thick it could no longer hold together. The solar panels tore off and the main body plummeted. Searing heat and impact shock shattered the falling body. Pieces scattered over the ocean. No damage was reported on the ground and no effort to recover the pieces was mounted.

Tiangong-1 was just the latest in a long line of heavy objects dropping out of the sky and crashing to the ground. Mir and Skylab, obsolete satellites and expended rocket stages have been falling since the start of the space age. The flock of debris in space today will rain space junk down on Earth for millennia to come. We're adding to that population every day.

As space assets grow heavier, their debris footprints will grow larger. Decommissioning things like our International Space Station should be planned—not just left to fa;; from the sky.

April 4, 2018

It's great white shark pupping season along the southern California coast. The mothers have been pregnant for a year. Now they're headed for warm shallow waters to deliver their pups. Each mother conceives dozens of embryos, but the young ate each other long ago. The strongest in each of every mother's two uteruses survive. Mom is having twins.

The twins will be born hungry. The four- or five-foot young will hunt the local fishery and grow, but first they'll have to outswim Mom. She's hungry too, and anything is fair game—her young or ours.

Mom's favorite food is seal. Humans swim like sick seals. If Mom thinks she's happened on an easy meal, she just might take a bite. Yech! She'll probably spit it out in disgust, but a single shark bite can be fatal. Be careful where you swim. Don't feed the great whites.

Dolphins look tasty too, and dolphins can't seek shelter on shore. They find safety in numbers. Sharks fear dolphins hunting in packs. Dolphins gang up to kill sharks that threaten them. The last time we had a great white attack a human around San Diego County, the news carried drone footage of a dolphin posse hunting the beast. Shark sightings along our local beaches ended that day.

Swim with the dolphins, not with the sharks.

March 28, 2018

The solar system was in a hit-and-run accident. A rogue star system sideswiped the solar system and careened off at a quarter million miles per hour. The sun revolved around the center of the Milky Way Galaxy at a half million miles an hour. She dragged her solar system—a light-year wide disc of debris—along with her. Seventy thousand years ago, a wandering binary star system grazed the outer edge of that disc. Objects orbiting out there in the Oort Cloud were deflected by the gravity of the passing stars. Some pieces were kicked out of the solar system; others were nudged inward. Those became comets. Those still emanate mostly from the region where the impact occurred.

The rogue star system fled the scene. Today, that system—the recently discovered Scholz's Star—is twenty light years away. The effect of the collision on that distant rogue is unknown. It may have picked up some of the ejecta from the Oort Cloud. It may have injected some of its own orbiting bits and pieces into the orbiting cloud or spewed them into interstellar space.

Impacts like this one are probably regular occurrences. Near misses of a light year or less are believed to happen about once in a hundred thousand years. Half light year collisions occur every million years or so—long times on the human time scale, but just a blink of the eye on a geological time scale. Close encounters like these may be the answers to some of the mysteries of the solar system—the odd orbit of Pluto, for example.

The sun is by no means unique. Similar crashes must happen everywhere. Another may have occurred in the nearby Alpha Centura star system. Proxima, the closest star to us today, is a dwarf star moving away from two main stars of the system. It may be rebounding from hitting the principle stars or it may be orbiting those two with a half million year period. Or both. We can't tell yet.

The vacuum of interstellar space is full of debris—large and small. There are rogue stars and rogue planets, but most of them are too small to detect. The sky is filled with the wreckage of thirteen billion years of collisions. At least one chunk is thought to pass through the solar system every year. Recently, one passed close enough to the earth and the sun to be detected and monitored. Oumaumau crossed the plane of the solar system, bent in the sun's gravity, and sped on to its next interstellar encounter. Collisions like that will continue. Space is a busy place.

March 21, 2018

Spring break is a time to read for fun. Many students run off to Florida or Cabo, but books can take them anywhere. They can visit the moon or Mars. They can tour a national monument or a far off land—all without a passport or shots. Books cost less than airplane tickets. There are no long lines or flight cancelations. This spring, give a book to a kid who has been kidnapped by his phone. Enjoy a book yourself while you're at it.

The perils of spring break are legendary. There are drunk driving and hangovers, drugs and pregnancy just to name a few. Vicarious perils are better. Follow the misadventures of two couples whose spring break debauchery drifted into the Bermuda Triangle. Read about their interrupted revelry in this excerpt from Fish Story. Buy the complete book there direct from the publisher to see the consequences. Autographed copies are available.

March 14, 2018

There's still plenty to do out beyond Pluto. The New Horizons science probe accomplished its Pluto mission and continued outbound. It got past that planet with propellant leftover and instruments poised to explore where no man-made object has ever been. Opportunities to explore abound out there and competition for New Horizons' remaining resources heats up.

The spacecraft flew a suite of instruments past the former planet and turned Pluto from a fuzzy blob into an exotic place. The probe discovered moons and mapped the planet. It found nitrogen ice plateaus, methane mountains, and buried oceans of running water. New Horizons didn't stop there. It flew on into deep space—fully capable of exploring a planet all over again.

What lay beyond? The Kuiper Belt—a ring of relics from the formation of the solar system. The probe was steered toward a large chunk it could reach. Things are few and far between out there. Even New Horizons—the fastest man-made object ever—will take years to get there. When it does, it will fly by grabbing data on the run—just like it did at Pluto. It will send those few hours of pictures and measurements back to Earth as it continues on. We'll learn as much about that object as we did when the probe explored Pluto.

That encounter won't exhaust New Horizons. There will still be some science left in that old probe. This will be the last chance to reach that far out into space for decades. We shouldn't waste it. But what should we do with what's left? Redirecting the probe toward a second Kuiper belt object is one option. Are Kuiper Belt objects alike? Turning the probe's science packages into an extreme deep-space telescope is another idea. Such an observatory would operate where the sun truly does not shine. It could see things near-Earth telescopes can't. Other proposals to exploit this once-in-a-lifetime asset have been suggested. Choosing among them will be hard.

March 7, 2018

A swarm of debris orbits the Earth. The bits and pieces are everywhere from BB-size to entire rocket bodies. Every piece flies faster than a speeding bullet—twenty times faster. Each packs a wallop up to fifty times its weight in TNT.

Even the smallest scrap can inflict catastrophic damage. A single paint fleck pitted the windshield of the space shuttle. Ongoing collisions turn big ones into little ones up there. The little ones are still lethal/A Chinese antisatellite weapon test shattered one old satellite into thousands of pieces. Near Earth orbit is jam-packed with deadly discards.

Hazardous scraps endanger space assets. There are three to six astronauts aboard the International Space Station at any given time. The orbiting population will increase as more space-faring nations emerge, and the race to return to the moon heats up. Even the smallest impact could kill space farers or their space ships.

Satellite services are integral to modern society. They're critical to navigation, communication, weather forecasting, and more. A two-cent screw could kill a billion-dollar satellite leaving us lost, alone and uninformed.

How do we protect astronauts and satellites from space pollution? Air Force radar tracks every orbiting object bigger than a baseball. The Air Force alerts satellite operators to duck out of harm's way. That's a good start, but it's not enough. The sky is full of invisible killers smaller than baseballs.

Many orbiters are shielded against unavoidable impacts with the small stuff. Weight is an issue. Heavy armor is out. Layers of thin sheets protect targets. Lightweight shields use the fury of the impact against the impactor. The energy of the initial impact shatters a projectile. Its pieces spread out before striking the next layer. The second stage is thousands of smaller projectiles hitting at thousands of points on the second sheet. Each of those shatters in turn and the process repeats until the original projectile is ground to dust too small to penetrate any further layers. Shields begin to look like something out of an old war movie, but the satellites survive.

February 28, 2018

The last generation of human computers took us to the moon, to the planets and beyond. All computers were humans until about sixty years ago. In those days, slide rules gave answers good to a percent or two. When that wasn't good enough, pen and paper was the only option. Notebooks were bound with sequenced pages. Arithmetic was done in ink in them. Important results were signed and dated.

An all-woman math team helped make Jet Propulsion Laboratory the space science center it is today. A recent book—Rise of the Rocket Girls: the Women who Propelled us from Missiles to the Moon and Mars, Nathalia Holt, (Little. Brown & Co, 2016)—describes their role in the Lab's evolution.

The Lab began in 1939 when California Institute of Technology exiled the Suicide Squad's rocket propellant experiments to a remote desert location. The Lab went to war along with the rest of the country in 1942—their mission was to develop Jet Assisted Take Off to lift overloaded bombers off short runways. Success in that project led to engineering missiles after the war. But the team's interest was space. America's first satellite Explorer 1 was theirs. Many more Earth satellites followed. The math group's calculations designed missions to explore the moon and the nearby planets. Their crowning achievements included the Grand Tour which explored the outer planets despite Washington's objections, plus Mars orbiters and landers. Their legacy continues to this day.

Today when we whip out a calculator to calculate a waiter's tip, it's hard to imagine that rockets were engineered and pioneering space missions flown with pen and paper calculations. Calculators and electronic computers came late. The first computing machines were moody, cumbersome and slow. Human computers raced them and won for the first many years. Electronic computers supported the Apollo flights—but only after spot-checking against human-computed results. Human computers are extinct now. The rocket girls' successors have turned their math aptitudes toward programming electronic computers to continue our march into space. Pick up a copy of the book and meet the women behind the space program.

February 21, 2018

Going to the moon is practice for going to Mars. The planet Mars is cold with a little atmosphere and high radiation from the solar wind. Our moon is a lot like that. It's cold with no atmosphere. It's beyond Earth's magnetic field so it's bathed in the sun's radiation too. The moon and Mars have a lot in common.

Robots go to Mars and it’s moons. Humans go to Earth and it's moon. A Chinese moon landing is expected soon. Japan and India are reportedly planning one too. After a fifty-year hiatus, the USA is talking about returning men to the moon. SpaceX has sold two tickets to a tourist loop around the moon…someday. NASA plans loops, orbits, and landings within a decade. They are considering a space station orbiting the moon. That would be the ideal laboratory to test people and equipment under prolonged exposure to solar radiation and zero gravity.

Lunar orbit is a great place to try things out before sending them to Mars. It's easier and safer to get to. Mars rockets are on the drawing board; moon rockets are nearing the launch pad. Aborting a mission is different there. Earth is only three days away when something goes wrong. Mars is at least eight months off. Stranded on Mars describes a mission trapped a hundred million miles from help.

Humans will follow their robots to Mars. SpaceX looks forward to colonizing the planet. Their giant rockets are an important step toward delivering people to the planet's surface. Like today's Mars robots, tomorrow's Mars colonists will only get a one-way ticket to the red planet. A round trip is a far greater engineering challenge. Another interplanetary rocket will be required for the return trip. Most of it can be delivered and parked in Mars orbit. It must be fully fueled. That's a lot of mass to fly across the universe. Martian visitors will need an ascent vehicle to fly to their orbiting ride home. That may—or may not—be the craft they landed in. In any case, it will need a lot of propellants to reach orbit. NASA hopes to manufacture some or all of those propellants on Mars to avoid the cost of transporting and landing all that mass.

Returning to the moon is just the next step in the long journey to Mars.

February 14, 2018

Human casualties continue to mount in the war on mosquitos. The mosquito remains the deadliest animal on Earth. The malaria it spreads kills one pregnant woman or child every minute despite worldwide efforts to control the epidemic. A half-dozen other tropical diseases rage on as well. Last year's Zika outbreak left a trail of brain-damaged infants in its path. The Zika threat has faded from the headlines, but not from the hospitals.

The battle against man's deadliest enemy goes on. The latest tactic will release billions of diseased male mosquitos in a Miami suburb. (The males don't bite.) The offspring of those males infected with wolbachia bacteria die before reaching maturity. It is hoped that the net effect of this will be a reduction in the local mosquito population. That reduction will be temporary at best.

The war against the mosquito has been going on since 1901 when Walter Reed established the connection between the mosquito and yellow fever. Improving sanitation and reducing mosquito breeding grounds diminished yellow fever in the tropics. That improved the health of both US Army occupiers and indigenous populations of tropical territories acquired in the Spanish-American War. It enabled the construction of the Panama Canal—which had been thwarted by mosquito-borne disease up until that time. The success of such mosquito control operations inspired new standards in public health.

The war on mosquitos escalated. Insecticides were heavily used and widely effective—maybe too much so. Concerns about collateral effects on the environment led to the banning of DDT—an affordable weapon against the deadly mosquito. The mosquito population came roaring back. Modern "green" alternatives like bed-netting and designer insecticides have proven ineffective and impractical. Testing of high tech pipe dreams like infected or infertile males will continue while humans keep on dying.

February 7, 2018

Carbon dioxide doesn't deserve the bad rap it's gotten. The media has been branded CO₂ a greenhouse gas, and blamed it for warming our planet. In fact, CO₂ is a feeble greenhouse gas. Its effect is overwhelmed by that of water—the dominant greenhouse gas in Earth's atmosphere. There's a lot of water vapor in the air, and water is infrared active. Together those two factors together regulate Earth's climate.

The CO₂ molecule is a rigid symmetric rod. It behaves more like nitrogen than like its triatomic cousin water. It freezes 140 F° lower than water does and has no liquid phase. Electrically, the molecule is a rock. It has neither a charge nor a dipole moment, so it's insoluble in water. Some CO₂ gas can be forced into water, but it bursts out as soon as the champagne is uncorked.

CO₂ gas is invisible. Light—infrared and all the rest—is an electromagnetic wave. An electrical change must accompany its absorption or emission. With no charge and no dipole moment, the CO₂ molecule has nothing to change, so optical transitions are "forbidden." Only quantum mechanical corrections give it any infrared spectrum at all. Its absorptions and emissions are faint and occur in an infrared spectral region dominated by water vapor absorptions. CO₂ absorbs a trace of the infrared that water vapor leaves behind. This is not the stuff of headline hype. If it were, Mars would be balmy with 960,000 parts per million CO₂.

Forget "global warming" or "climate change." The principle hazard from our CO₂ emissions is not to our atmosphere, but to our oceans. That's where most of the gas goes. A little dissolved CO₂ reacts with H₂O to form carbonic acid H₂CO₃ that acidifies everything from soft drinks to the oceans. The falling pH is affecting sensitive ocean ecosystems.

January 31, 2018

The flu is serious—deadly serious. Every year, the flu kills thousands—often many thousands. The 1918 flu season was the worst so far. It became the deadliest pandemic of all time. An estimated half billion people caught that disease; some one hundred million died of it that year—that's one person in every twenty worldwide. Only the twenty-five million deaths from the Black Plague of the Middle Ages even came close to that level.

This year and every year, the flu will infect millions. Each body will fight back, and will usually win its battle against the virus. Once that battle is won, the body becomes immune to further infection by that virus. New viruses attack vulnerable victims with impunity. As resistance spreads throughout the population, later viruses find fewer opportunities to infect and the epidemic dies out. Viruses evolve fast, and a new one soon appears to take the old one's place.

In 1918, the bird flu on a Kansas chicken farm adapted to human hosts with catastrophic consequences. The first 1918 flu patient reported to sickbay in Fort Riley, Kansas. Within a week, a hundred were hospitalized, then five hundred. The new flu started popping up all around the country. Troops from Fort Riley joined the American Expeditionary Force entering the First World War carrying this flu with them. Crowding and unsanitary conditions at the front lines spread the disease. Soon massive—but still classified—casualty levels showed up on both sides. German and Austrian forces were especially hard hit. They had to surrender. The flu ended the conflict. Highly contagious: it spread beyond the war zone and spanned the globe. It reached Asia and Australia within months. Hospitals were overwhelmed. Wards overflowed. Bodies piled up. Mortuaries couldn't keep pace. Terror spread.

The normal flu culls the herd: killing the aged and the infirmed. The 1918 flu did just the opposite. The effects were devastating. This flu switched the body's immune system into overdrive. The body attacked itself. The stronger the body's immune system, the greater the damage. The healthiest people suffered the harshest attacks. Those often proved fatal. The 1918 flu decimated the population of healthy twenty-something adults. The losses from that generation would propagate through history for decades to come.

This year's flu is nasty, but, by no means, a repeat of the 1918 one. It's sickening millions and killing thousands. Every year, the Centers for Disease Control tries to anticipate the latest flu virus and fields a vaccine to combat it. Each year, the virus comes up with a few surprises, and this year is no different. The flu shot is never 100% effective, but it's still important in protecting against the flu. Everyone who can needs to get a flu shot every year until a universal vaccine is developed.

January 24, 2018

Opioid overdoses kill more people under fifty than anything else. They are the scourge of GenX and GenY. Overdose deaths are a burden to society, but there's even more to it. There are junkies driving cars under the influence—killing themselves and others. There are junkies suiciding over their misery. There are junkies sharing needles picking up hepatitis, AIDS, and more. The walking wounded left behind are zombies—not much different from dead.

Addicts live in la la land. Their families live in hell. Living with zombies can't be easy. The dread of discovering loved ones dying fills family member's days. Anything the addict hasn't stolen to put up a vein goes to treat the problem. A family's life savings, their car, and their house can vanish in no time. Rehab is expensive and treatment breaks the bank. Finally the community picks up the user's tab.

Naloxone can reverse an opioid overdose if it is administered in time. It's available to counter the accidental overdoses encountered by first responders, by law enforcement and by morticians dealing with the drug epidemic. Emergency medical personnel, police and drug sniffing dogs are exposed to high levels of opioids in the line of duty. The residues on overdosed remains are hazardous to handling their bodies.

There's a fine line between getting high and overdose. Antidote availability encourages careless attitudes among drug users. They'll shoot up in emergency room parking lots for rapid rescue from casual overdoses. A recent New York Times article about a family with fentanyl-addicted adult children described a family meeting where the son overdosed four times in six hours. Each time the family called emergency responders who revived him. Hours later, he would do it again. Problem places like New Hampshire and West Virginia are stretched to the breaking point by their opioid users. How long can they afford to continue reviving junkies who overdose four times in six hours—at $2000 a pop?

January 17, 2018

Dropped from one NASA plan after another, Pluto became the only unexplored planet in our solar system. So the authorities demoted it. It was no longer a planet at all—just some mysterious object in the distant sky. Even the mighty Hubble telescope could barely see it. The frigid world was a blotchy blur covered in ices of materials that were gases or liquid everywhere else in the solar system. The farthest place in the known universe was a place science just had to see. Pluto exploration would complete NASA's survey of the solar system. A dedicated mission was planned, then canceled, then revived, and then halved again. New Horizons—the fastest manmade object ever—was built and launched before Congress could have its way with the Pluto program one more time. Twenty years of technology advances made New Horizons the most sophisticated planetary probe of all time.

The little orphan planet Pluto had a few surprises in store for the visiting space probe. One high-speed flyby captured a flood of information about Pluto. These data will be the basis of human understanding for the foreseeable future. (No return visit appears on the agenda of any space-faring nation today.) Preliminary analysis shows the orphan planet is a unique place. Rock and ice make up the planet, but Pluto's most obvious feature is a nitrogen ice glacier twice the size of Texas. The geography is extreme. There are rifts bigger than the Grand Canyon and mountains as tall as the Rockies. Coats of nitrogen ice sloughing off those mountains are building the giant glacier. Much of the planet is water ice hundreds of miles thick. It is thought to house liquid water beneath it. Frozen ejecta from cryovolcanos spewing liquid water dot the surface. Thousand-foot tall columns of methane ice are found there as well. Analysis of the Pluto data continues. There may be more surprises in store.

In the meantime, New Horizons is flying on to explore objects in the Kupier belt beyond. There, it will examine relics from the time of the creation of the sun.

Distant Pluto is no longer the farthest known planet. Since New Horizons was launched, thousands more planets have been discovered orbiting nearby stars—light-years not light-hours away. We've seen stars wiggle as their exoplanets swing around them. We've seen stars dim as their exoplanets blocked them. But we've yet to actually see an exoplanet. All are far beyond the capability of the Hubble telescope. Someday, we may get fuzzy images of a few of them. Like yesterday's fuzzy pictures of Pluto, there will still be lots more to learn about those planets. They may all be as unique and different as Pluto.

January 10, 2018

It's cold and snowing on Mars, too. The planet's poles are water ice. They're covered with drifts of dry ice snow in the winter. Carbon dioxide gas in the Martian atmosphere begins to freeze when the temperature drops below -110°F. The flakes sublime when things warm up above -110°F. (Subliming is different from melting. A solid sublimes directly to gas without ever being liquid.)

Earth orbits in the Goldilocks zone where water comes in solid, liquid and gaseous forms. Water vapor in the atmosphere condenses and precipitates as either liquid or solid—rain or snow. Our poles are covered with solid water. Much of the area between the poles is covered with liquid water.

Our planet isn't the only place with water in all three forms. The moons Enceladus and Europa are covered with layers of water ice. They host lakes and seas underneath all that ice. Cryovolcanos on those moons spew jets of water into space. Vapors and droplets freeze quickly. Some of the water crystals fall back to the surface as snow; some escape to form rings around their planets.

There's snow and ice all across the solar system. Io, another moon, has active volcanoes that generate sulfur snow. On Pluto, methane snow falls on nitrogen ice. (Methane freezes at -300°F and nitrogen at -346°F.) The snow on the coldest moon Triton is flakes of nitrogen. There are even places on the moon and on Mercury where the sun never shines and water ice and snow is believed possible.

We have discovered thousands more planets beyond our solar system. Some are Earth-like. Many are not. As we learn more about them and their moons, we expect to find winter there is just like winter at home.

January 3, 2018

Virtual reality is opening new frontiers in medicine. Virtual reality immerses the user in a computer-generated three-dimensional world. Viewed via specialized headsets, fantasy worlds offer modern playgrounds. Real world images support teaching, planning and operating.

Every medical student can now have a digital cadaver. There's no shortage of volunteers any more. The cadaver comes down with the disease of the week, and changes genders at the drop of a hat. Surgeries and dissections run smoothly. With UNDO and REBOOT options, the patient ends up no worse for wear. The student repeats the process until mastering it, and returns once more to prepare for exams.

Medical school is only the beginning. The digital body provides a test bed for planning challenging surgeries. It provides a realistic map of possible routes to a patient's defect or deformity. Surgical alternatives can be practiced and compared in virtual reality—where no one dies—before being tested in real reality—where patients do die.

Virtual reality is in today's operating rooms. Less invasive procedures shorten surgical recovery costs and times. For those, laparoscopic surgeries use miniscule instruments at the ends of long tubes going deep inside the body. The doctor has no direct visual image of the process. Tiny lights and cameras among the laparoscope end instruments provide real time images of the surgeon's working area. For the more demanding applications, that data is presented as virtual reality. Laparoscopic microsurgeries and biopsies done that way have a high success rate. Advanced versions using the Da Vinci Robot—which isn't a robot at all—employ the same kind of virtual reality interface between the surgeon and the operation. The patient fares as well as the virtual reality avatar.

December 27, 2017

How cold is it? People have been asking that question since the beginning of time. The answers have varied from "it's a three-dog night" to "it's ten below." We've discovered ways to put numbers on just how cold it is.

Simple materials expand when they get hotter and contract when they get colder. Just how much gives us a convenient measure of the temperature. Mercury is just one of many expanding liquids which have been used in measuring temperature. We trap a drop of it in a bulb leaving only a narrow channel for it to expand into. We read the mercury's rise there to tell the temperature. Fine capillaries yield precise measures to assess fevers; wider ones tell us whether we need a sweater today.

Long before there was mercury, there was brandy. The Galileo thermometer used a collection of balls of slightly different densities. Those lighter than the brandy floated; those heavier sank. As things heated up, the host liquid expanded. It became less dense. Fewer balls could float. How many gave temperature a number. The results were imprecise, and the Galileo thermometer is mainly decorative today.

Solids, liquids and gases all expand and contract with temperature. Their thermal responses support a range of temperature measurement and control applications. Metals swell and shrink with temperature—albeit differently. Binding two metal strips with differing thermal responses together creates a strip that flexes with temperature. It twists away from the side that expands more. Coiling such bimetallic strips amplifies the effect. These are the mechanisms inside many mechanical thermometers. Metals conduct electricity, so their position is easy to read. They're the temperature sensors inside many classic thermostats—keeping us warm inside no matter what the answer is to How cold is it outside?

December 20, 2017

The malaria super bug is here. The world's leading killer of women and children evolves drug resistance faster than humans can develop drugs against it. Malaria has been a scourge since the beginning of time. A century of efforts to eliminate the germ have bred a malaria parasite immune to a dozen malaria drugs. Efforts to eradicate its mosquito carrier have produced insecticide-resistant bugs.

A revolutionary new antimalarial drug, artemisinin, was successful for a few decades. Artemisinin resistance has now appeared in Asia and is spreading. Tropical Africa is bracing for the arrival of super mosquitos carrying super malaria. The current one-a-minute death rate could double until a new drug is found/

Evolution creates resistance—whether drug resistance or insecticide resistance. The first dose kills off the little old lady bugs. The next dose knocks off their wimpy sisters. And so it goes. All get sick. The weak die. Only the strong survive. The Hell's Angels bugs pass whatever advantage kept them alive on to their descendants. Repeat that process a thousand times and a resistant strain is created. Malaria parasites produce a new generation every couple of days—mosquitos every few weeks. Malaria rebounds from any medical threat within a few years. The process repeats with every new drug. When every drug is defeated, the parasite is a super-bug.

December 13, 2017

We're headed for a cosmic collision. Astronomers warn us that the Andromeda galaxy is headed straight for us at a quarter-million miles an hour. Andromeda's leading edge will hit the outer reaches of our Milky Way Galaxy in about two billion years. These galaxies—two whirling dervishes—will buzz saw through one other and move on.

Andromeda will zip across our galaxy for a few billion more years after it arrives. There will be twice as many stars in the night sky when that happens—that's about all. With only a few billion stars each scattered across a hundred thousand light years, both galaxies are mostly empty space. Their stars won't be crashing into each other. Near misses—by a light year or two will be more common. Their gravity may jostle a few stars and distort some constellations. Captive planetary systems may be distorted or ripped asunder. Bits and pieces may be ejected into interstellar space to wander as dark asteroids or rogue planets forever.

When it's all over, the two galaxies will travel on looking pretty much like they do today. By that time, our sun will have burned out. Our descendants will have long-since become an interstellar species or an extinct species.

December 6, 2017

The average American spends more than forty hours a week watching television and trolling social media. That's a full-time job without pay. Successful businessmen make time to read instead. Arthur Blank, a Home Depot founder, allots two hours a day to reading; billionaire Mark Cuban dedicates three hours a day to it. Successful people read a lot. Warren Buffett reads five hundred pages a day. Bill Gates reads a book a week. Mark Zuckerberg reads one every two weeks. If they have time for books, we and our children do too.

Children's reading shouldn't be just for homework. Don't condemn your kids to another holiday of season of soap operas and space invaders this year. Treat them to books they will enjoy—not just schoolwork enhancers—real enjoyable books. If they're lively, they may inspire a lifelong good habit..

The longest book starts with the first page. Visit your local library. Fill your home with books. Ask Santa for science fiction and adventure stories. Check my books out for a few suggestions. Young adults interested in science, engineering, or medicine may enjoy short essays like this one collected in What Color Are Little Green Men? You and your kids can travel from the Bermuda Triangle to the bottom of the sea or all the way to Mats in my novels. Send the kids somewhere they've never been before—without ever leaving home.

November 29, 2017

A shard from the heavens zipped through our solar system last month. This interstellar asteroid was as cold as deep space, so it presented no heat signature. It was only detected by the sunlight it reflected on its way out of our solar system.

The object was detected in Hawaii. Tracking showed it was not just another asteroid and the world pointed its telescopes in its direction. The interstellar visitor was given a Hawaiian name Ouamuamua (pronounced like it came from the Beach Boys silly song Papa-Oom-Mow-Mow of fifty years ago.) The name means "scout." It was a small dark solid—probably rock. It carried no ice or other volatile substance that would have formed a comet-like tail when passing close to the sun. It was a tumbling needle-shaped object some four football fields long. It was flying at sixty thousand miles an hour—twice the speed of the fastest man-made object to date. It must have flown millions of years getting here because there's nothing close by in the direction it came from. Ouamuamua swerved in the sun's gravity and flew off into eternal night before we could learn much more about it.

There must be countless others like Ouamuamua out there. The universe has evolved through almost fourteen billion years of violence. Interstellar clouds have collapsed into stars that burned bright for a few billion years, then sputtered and died cataclysmic deaths. Leftovers from star formation became orbiting discs of debris. Some of that debris coalesced into solid bits and pieces; those merged into bigger chunks—asteroids, comets, and even planets. Growth was violent. Hard collisions shifted orbits and even kicked bodies right into interstellar space. Crashing into passing stars or planets bumped more pieces off into space. There's fourteen billion years of cosmic shrapnel out there somewhere.

Space is filled with swarms of these interstellar vagabonds, but they are among the most challenging objects to see. They are cold and dark—almost as dark as black holes. We've detected a few rogue planets floating free through space. Those are nearby and large enough to retain some core heat. There must be many more of them we can't see. Smaller bits and pieces—like our recent visitor—must be everywhere.

November 22, 2017

Earth just emailed extraterrestrials.

Astronomers announced the discovery of an "earth-like" planet a mere eleven light years away. That's the distance light travels in eleven years—or the distance the fastest man-made object could travel in a quarter million years … longer than humans have been around. Look for a return email in twenty-five years or so. A drop-in visit may take a while longer.

There's been no direct observation of the new planet or of any of the other earth-like exoplanets in the neighborhood—only the oscillation of their host stars as they orbit. Images are not possible yet—even for the closest one around Proxima B where the aliens in my novel Dead Astronauts came from. The newly discovered planet is a little bigger than earth, and just the right temperature for liquid water. Whether it or any other of these planets host liquid water or an atmosphere is unknown. There's always hope that earth-like conditions have prevailed, and intelligent life has evolved. So why not plunge ahead and email them? What could go wrong? PLENTY, according to Stephen Hawking—probably the smartest human alive today.

A group dedicated to Messaging Extra Terrestrial Intelligence, METI, has gone ahead and beamed a message at the planet. Communicating with humans on the opposite side of the globe is difficult. Communicating with other intelligent earthlings—like dolphins or squid—has yet to be accomplished. Communicating with aliens should be a real challenge. What did the METI message contain? It is reported that they broadcast some digital music and some basic math to demonstrate our culture and our technology. METI's next message will contain a callback number and a due date.

No telling how the aliens are expected to decode the METI messages if they receive them at all. Will they decide to respond? Or will their own Stephen Hawking urge caution?

Look forward to an empty email box. The METI signal will have dispersed over a cosmic expanse by the time it arrives. Human technology couldn't detect the METI message or the extraterrestrial answer against the background of space noise.

November 15, 2017

The frontiers of medicine took a giant step forward. Stem cells and gene therapy reversed a usually fatal genetic disorder.

A young boy's skin couldn't make one of the proteins that glue the epidermis on. His skin would flake and fall off at the slightest touch. He was hospitalized with only 20% of his skin attached. His prognosis was grim. A skin graft was his only hope. His body rejected his father's donation. He had no closer living relative—except himself.

A graft of his own defective skin would not help. If only the defect could be corrected. Dermatologists took a patch of his remaining skin, and reversed its development back to stem cells. They attached healthy copies of the boy's defective gene to a virus and treated the stem cells with it. That gene would function as a template for synthesis of the missing protein. The doctors then reversed the stem cell process and induced the modified ones to mature into skin tissue. The boy's body didn't reject those laboratory skin cells.

Today, medical laboratories are growing skin for burn victims. Using the same technology, they grew healthy skin for this patient. At least 80% of his body was covered with his new skin. The procedure was a success. Two years later, he is leading an unrestricted life—playing soccer without worrying about his skin falling off.

Pioneering efforts like these demonstrate the potential of medical technologies under development in the laboratory today. They will make their way into your doctor's repertoire in good time.

November 8, 2017

Thinking of traveling to Mars? Be sure to ask about a round-trip ticket. Getting there is only the beginning. The trip home won't be nearly as easy as getting there.

You left Earth from a dedicated facility custom-designed to launch you on your journey. It had plenty of electricity and water. There were redundant backups and a thousand trained experts standing by. Air was free there.

You'll return from a primitive launch pad in the middle of an alien desert. You'll be on your own with no facilities and no backups. Your pilot will be the veteran of a thousand simulated launches of a vehicle that has never been flown before. Air will be more precious than gold. You'll be dead twenty minutes before Earth knows you're gone.

The and back leg of a Mars mission is an essential part of mission planning. Returning astronauts will rendezvous with an Earth return vehicle preplaced in Mars orbit. The bus home will have flown there on a minimum energy trajectory and then sat unattended in the cold and the radiation of space for a year or two. There will be no backup. The vehicle must wake up fully capable for the ride home. That's step two.

Step one will be equally unforgiving. Transport from the planet's surface to orbit will require a major rocket launch. This massive rocket will be built on Earth, flown to Mars, and landed with the astronauts. Transporting something that big to Mars will be expensive. It is hoped that the propellants for the return trip can be manufactured on site. That would yield a dramatic cost savings.

We need to learn more about Martian resources before proceeding down that path. Mars has water—where and how much we don't know. Solar-powered electrolysis into hydrogen and oxygen has been suggested. We'll need the oxygen. Hydrogen is hard to store. Hydrogen storage tanks are huge, and hydrogen gas leaks through most seals. It may be best to tie the hydrogen to something else—like nitrogen—for storage and handling. (Hydrazine, a nitrogen/hydrogen compound is a common rocket fuel.) We may gain hands-on experience turning moon water into propellants before venturing beyond. Mars also has methane—again where and how much we don't know. Methane is a much better fuel to store, but is useless without oxygen. The Martian atmosphere is mainly carbon dioxide. There are catalysts for solar-powered production of carbon monoxide and oxygen from carbon dioxide. (Carbon monoxide burns okay.) Whatever approach works, the first industry on Mars will be a chemical plant.

November 1, 2017

American addicts are funding a war on America. Afghanistan is the principle source of heroin and opium—part of the opioid epidemic sweeping the country. The New York Times reports the Taliban is making billions off those drugs. In the beginning, the Taliban taxed the opium poppy farmers in territory they controlled. Now it has expanded into the business of refining and processing their crops for export. The equipment required is simple and cheap. An illicit opium lab can be set up in a day. Losses to drug raids are rare and affordable. The billions the Taliban earns make for wealthy warlords and buy weapons to kill American troops and allies.

The demand for drugs funds a criminal empire far beyond Afghanistan. Synthetic opioids like fentanyl and oxycodone require more synthesizing opioids have created the current drug overdose epidemic. The cartels of Central and South America have battled their local governments for a generation. Addicts' dollars will fund criminal and paramilitary operations worldwide until we do something about it.