{"id":1585,"date":"2014-03-18T11:20:12","date_gmt":"2014-03-18T15:20:12","guid":{"rendered":"http:\/\/localhost:8888\/wp-a_lawler\/?p=1585"},"modified":"2024-12-21T11:17:45","modified_gmt":"2024-12-21T16:17:45","slug":"its-alive-1","status":"publish","type":"post","link":"https:\/\/www.andrewlawler.com\/content\/its-alive-1\/","title":{"rendered":"The Best of Science and Nature Writing 2011 It\u2019s Alive \/ Discover Magazine (Notable)"},"content":{"rendered":"

The Best of Science and Nature Writing 2011 It\u2019s Alive \/ Discover Magazine <\/strong><\/span><\/h2>\n

(Notable)<\/strong><\/span><\/h2>\n

For those seeking life on Mars, it is the best of times and the worst of times. Nearly 35 years after NASA\u2019s twin Viking robots eased down onto its ruddy surface, there is still no incontrovertible evidence that living organisms ever existed on the fourth planet from the sun. Few researchers accept one scientist\u2019s claims that the 1976 Viking experiment detected life. The brief frenzy over possible fossils in a Mars meteorite has fizzled. And even after billions of dollars\u2019 worth of adorable rovers and eagle-eyed orbiters have prodded and probed the planet, the results have been at best ambiguous and at times downright confusing.<\/span><\/p>\n

Yet a growing number of space scientists are upbeat, even buoyant, about the likelihood that Mars is a living world. \u201cA variety of discoveries are creating a kind of buzz,\u201d says Chris McKay, an astrogeophysicist at NASA Ames Research Center in Mountain View, California. \u201cAnd people seem more enthusiastic. It\u2019s group psychology.\u201d There has been no single major breakthrough in the search, but a subtle change is taking place within the clubby community dedicated to finding and bringing back organisms\u2014dead or alive\u2014from the Red Planet.<\/p>\n

It is not now considered a stupid idea to look for life on Mars,\u201d says Bruce Jakosky, a planetary geologist at the University of Colorado at Boulder. \u201cIn recent years the case has been made again and again that life is or was possible there.\u201d Undergirding this new optimism are reams of data\u2014from Earth-based telescopes as well as Mars orbiters, landers, and rovers\u2014that have slowly painted a much more complete and complicated picture of the Mars environment stretching back billions of years, providing intriguing hints that microbes might have once evolved there, and might yet endure.<\/p>\n

For younger researchers who were children when Viking landed, it is hard to conceive of a solar system where Earth is the only life-bearing place. They take it for granted that organisms can endure extreme environments. Weird and wonderful forms of life have been found deep within the Earth\u2019s crust, swimming in boiling pools, and clinging to vents deep under the ocean surface. That versatility heartens those looking beyond our own planet. \u201cIf it smells like life and looks like life, then it could be life,\u201d says Dirk Schulze-Makuch, a 46-yearold astrobiologist at Washington State University in Pullman. \u201cThere\u2019s a strong sense that we should get missions going to nail this down. I\u2019d be surprised if Mars were sterile.\u201d<\/p>\n

That assessment would have raised eyebrows 10 years ago, but it is no longer outside the mainstream. Even William Schopf senses a shift in attitude. The UCLA paleobiologist was the house skeptic at NASA\u2019s 1996 press conference introducing the Mars meteorite and its alleged fossils of microbes. While he remains skeptical, Schopf believes that if biology ever took hold on Mars, it is probably still there. \u201cIf we\u2019ve learned one thing in recent years,\u201d he says, \u201cit is that life is resilient.\u201d<\/p>\n

No one knows that better than John Baross, an astrobiologist at the University of Washington in Seattle. A very resilient life form nearly killed him. When the bacteria attacked, his body turned as red as a fireplug as his temperature climbed to 104 degrees Fahrenheit. In eight days he lost 38 pounds as the invader released a toxin that ate away at the muscles in his legs and back. While doctors frantically pumped his bloodstream full of antibiotics, the organism hid behind a thin protective skin of sugary slime that made it impervious to the medicine.<\/p>\n

Baross at the time happened to be studying just such slime, known as a biofilm. His graduate students sent the hospital extensive information on the bacterium and its protective cloak to share with the puzzled physicians. \u201cWe knew more about it than they did,\u201d Baross recalls wryly. Finally, an exhaustive battery of tests pinpointed the invader\u2019s primary location: the liver. Doctors were then able to tailor the meds to overwhelm it. Even so, it took Baross seven painful months to recover.<\/p>\n

Baross\u2019s personal encounter with the bacteria deepened his belief that such biofilms might extend from the bottom of the ocean into interplanetary space. Two thousand feet below the sea, in the cracks of the Mid-Atlantic Ridge, he and his students recently discovered single-celled organisms flourishing in highly alkaline water close to the boiling point. The gooey film encasing these organisms is the key to their survival.<\/p>\n

Such sticky mucilage is among the oldest of known organisms, dating back more than 3 billion years. And Baross\u2019s lab work shows that the mid- Atlantic biofilms have an astonishing capacity for transferring genes. That facility may have been just what early life needed to give rise to the widely varied genomes that walk, swim, and fly on Earth today.<\/p>\n

Other researchers are busy scouring our planet to test the limits to organic life. They have found Cephalosporium (fungi that live in highly acidic environments), Euglena and Chlorella (algae that grow in heavy metals), and a cockroach that can survive massive doses of gamma radiation. Some archaea\u2014a domain of microbial life that was little understood when the Viking landers reached their destination\u2014live in even more extreme situations, flourishing in temperatures far above the boiling point of water and surviving in thick brine.<\/p>\n

The many extreme-life discoveries led NASA to ask the National Academy of Sciences for help in knowing what to search for beyond our planet. Baross chaired the investigating committee. The group reported that carbon-based life dependent on liquid water and using DNA \u201cis not the only way to create phenomena that would be recognized as life.\u201d Quickly dubbed the \u201cweird life report,\u201d the study dramatically concluded that many locales in the solar system could support life drawing on a variety of liquids and energy sources. \u201cI think life existed on Mars,\u201d Baross says. And if it did, he\u2014like Schopf\u2014 thinks that it, or evidence of it, is probably still there.<\/p>\n

Life\u2019s resilience and the sheer diversity of terrestrial organisms were not obvious on July 20, 1976, when the first Viking lander touched down on Mars\u2019s Chryse Planitia lowlands, programmed to find life as we then knew it. At the time, that meant looking for water, warmth, and the right nutrients for delicate organisms. Scientists didn\u2019t dream that life could flourish in brine pockets of sea ice or in mine water filled with heavy metals. \u201cIn hindsight, what we did with Viking was incredibly naive,\u201d Jakosky says. \u201cWe have since learned that life can be exceedingly difficult to detect.\u201d<\/p>\n

And yet one man insists that the Viking search yielded a positive result. \u201cIn my mind the question is resolved,\u201d says Gilbert Levin, the leader of one of the Viking experiments, the Labeled Release Life Detection Experiment. Ever since the data came in from Viking, he has argued that his tests gave evidence consistent with life on Mars; now, after further analysis, he believes they prove its existence. His colleagues have responded with doubt, even derision, over the years. But growing knowledge about extremophiles on Earth and the environment on Mars has given Levin, who just turned 86, hope that his assertion will finally be taken seriously.<\/p>\n

Levin\u2019s recipe for smoking out Martian life was elegantly simple: Scoop up Martian dirt with the Viking arm, seal it in a chamber, add an organic compound with a trace of radioactive carbon, and wait. Any bacteria similar to those on Earth would exhale radioactive gas. Next, take a second sample and subject it to high heat to kill off any microorganisms, then add more radioactive compounds to the chamber. If there is no subsequent radioactive release, that demonstrates that there are living microbes on Mars.<\/p>\n\n\n\n
\"MarsDiscover_img_6a\"\"MarsDiscover_img_5a\"<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Indeed, the chambers on both Viking landers signaled a radioactive reading in the first round followed by none in the second. Levin celebrated with champagne and cigars. But within days that finding was contradicted by results from the gas chromatograph spectrometer, which detected no sign of organic compounds, much less evidence of life. And without organic compounds\u2014 molecular combinations of carbon and hydrogen\u2014life as we know it is not imaginable.<\/p>\n

Scientists assumed that a nonbiological reaction had caused Levin\u2019s instruments to register life, and the lack of organics seemed to seal the deal. NASA lost interest in what seemed a quixotic quest, and Mars exploration was abandoned. \u201cAnd from then until now, the gospel is that Mars doesn\u2019t have any organics in its soil,\u201d McKay says. The irony is that we now know such compounds litter the solar system, present everywhere from Saturn\u2019s moon Titan to common meteorites; organics are probably present even on Mars\u2019s little moons, Phobos and Deimos.<\/p>\n

In 2008 the NASA Phoenix lander added fuel\u2014literally\u2014to the debate. The robot detected perchlorates, charged particles consisting of a single chlorine atom surrounded by four oxygen atoms, in the arctic soil taken from near the planet\u2019s north pole. That molecule helped Phoenix get to Mars in the first place, since perchlorate is a powerful rocket fuel. Some researchers took the presence of perchlorate as another sign that life on Mars\u2019s surface is unlikely, since the compound is a powerful oxidizer, acting like a bleach at high temperatures.<\/p>\n

But McKay believes the find is an exciting hint of life\u2019s presence. \u201cThis is the most important discovery since Viking,\u201d he contends. \u201cThis made our whole world change.\u201d In his reading, the Viking gas chromatograph scooped up soil, heated it, and in so doing activated the perchlorate, which then destroyed the very organics the spacecraft was searching for. Only a single type of molecule, which could have been produced by the perchlorate reacting with organics, appeared in each sample. \u201cThe results were misinterpreted,\u201d McKay says. \u201cAnd our whole community is in denial.\u201d<\/p>\n

Schulze-Makuch agrees, saying the Viking gas chromatograph lacked sensitivity; it also failed to register life when a version of the device on Earth was fed a sample from the Dry Valleys of Antarctica, a seemingly barren place that actually hosts some microorganisms. He adds that perchlorates could serve as a potent energy source as well as a way for life to access water. In the Atacama Desert of Chile, one of the world\u2019s most desiccated spots, perchlorate in the soil can condense water out of the atmosphere. Intriguingly, small droplets\u2014which appeared to be water\u2014were spotted in photos on the legs of the Phoenix lander.<\/p>\n\n\n\n\n
\"MarsDiscover_img_4\"<\/td>\n<\/tr>\n
Micrograph of a Mars meteorite on Earth; the rim of Concepcion, a young Martian crater; Viking 2 gathering Mars soil for analysis<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

So while some researchers see the perchlorate find as another sign of life\u2019s unlikelihood on Mars, Schulze-Makuch is positively elated. \u201cFrom an extremophile perspective, this story is a plus for life,\u201d he says. For example, instead of using a water-based substance as a basis for its cellular processes, a Martian organism might use hydrogen peroxide, a molecule similar to perchlorate that is abundant on Mars. The debate may finally be resolved when NASA\u2019s Mars Science Laboratory arrives in the autumn of 2012. \u201cOur great hope is that we will find organics either in the soil or inside rocks\u201d drilled by the robot, McKay says.<\/p>\n

The renewed possibility of organics on Mars has led researchers to reconsider the conclusions of Levin. \u201cThe community is not convinced he\u2019s right, but he\u2019s a first-rate scientist, and you can\u2019t just dismiss what he says,\u201d Jakosky notes. At UCLA, Schopf argues that laboratory tests long ago showed how nonbiological soil chemistry could have produce the results seen on Viking. But he admits that the mainstream view could prove false. \u201cLevin isn\u2019t necessarily wrong,\u201d he says. \u201cThere are lots of examples of people who stick to their guns and are proved right \u2014think of Alfred Wegener and continental drift.\u201d<\/p>\n

Like Levin, the team that claims it found evidence of life in a Mars rock dubbed Allan Hills 84001 remains unbowed in the face of widespread scientific skepticism. That rock was blasted off the surface of the Red Planet millions of years ago and fell to Earth as a meteorite landing in Antarctica. At its famous 1996 press conference, a group from NASA Johnson Space Center led by David McKay\u2014no relation to Chris\u2014laid out four lines of chemical and physical evidence that they believed made a strong case for life on Mars.<\/p>\n

After years of further analysis and debate, many astrobiologists think that three of those four can be shown to be the result of nonliving chemical or geological activity. The fourth line is tenuous but more intriguing. The meteorite is full of grains of an iron oxide mineral called magnetite, each grain a mere 20 to 120 nanometers across. On Earth, organisms called magnetotactic bacteria routinely manufacture such tiny crystals. But in 2003 two papers noted that there are other ways to make magnetite crystals, such as slamming a rock from space onto the Martian surface. The intense heat could degrade carbonates and form similar structures.<\/p>\n

In November 2009 the McKay team struck back with a new paper. Using advanced microscopy, they noted that the crystals in the Allan Hills sample are too pure to be explained by a thermal event. \u201cWe do not believe it is too incautious to restate our original hypothesis that such magnetites constitute strong evidence of early life on Mars,\u201d said lead author Kathie Thomas-Keprta at the time. A member of the original Allan Hills team, she insists that there is no longer an alternative to the existence of life in the formation of the crystals. \u201cWe\u2019re left with only one hypothesis standing,\u201d she says. Her next step is to find corroborating evidence in other meteorites.<\/p>\n

Baross argues that if Earthlike life-forms created these crystals, they would have to be highly sophisticated organisms. Given the harsh environment, he finds it unlikely that any Mars life evolved far beyond simple biofilms. Other researchers say that any number of chemical processes might be responsible. \u201cIt\u2019s almost a fool\u2019s errand,\u201d Jakosky says. \u201cYou could spend the rest of your life altering formulas to show what can or cannot make magnetite.\u201d<\/p>\n\n\n\n\n
\"MarsDiscover_img_7\"<\/td>\n<\/tr>\n
Baross argues that if Earthlike life-forms created these crystals, they would have to be highly sophisticated organisms. Given the harsh environment, he finds it unlikely that any Mars life evolved far beyond simple biofilms. Other researchers say that any number of chemical processes might be responsible. \u201cIt\u2019s almost a fool\u2019s errand,\u201d Jakosky says. \u201cYou could spend the rest of your life altering formulas to show what can or cannot make magnetite.\u201d<\/span><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Thomas-Keprta believes the data and the momentum are on her side. \u201cAs a group, scientists now consider Mars to have once been habitable, and it may still be so,\u201d she says. \u201cWe\u2019re a long way from the dry and desiccated deserts of the past. Mars could have supported a biosphere.\u201d<\/p>\n

Some researchers believe the mere presence on Earth of a meteorite from its distant neighbor underscores the possibility that life has been transferred from planet to planet.<\/p>\n

Perhaps the most intriguing sign of life since the Allan Hills announcement was the detection of methane in the thin Martian atmosphere. The discovery by a number of research teams did not grab headlines around the world as the Mars rock did, but it may prove more important in the quest to find life. On Earth, methane is emitted by two sources: living creatures, such as cows, and geological formations, such as mud volcanoes. So the methane on Mars may be the result of geological activity or life\u2014or both.<\/p>\n

Methane on Mars may be the result of geological activity or life\u2014or both.<\/p>\n

Last year, using groundbased telescopes, a team led by Michael Mumma of NASA\u2019s Goddard Space Flight Center reported that Mars\u2019s methane is concentrated in vast plumes. The team charted the spread of several plumes across the northern hemisphere as summer approached and noted that they seemed to originate above volcanic regions. One plume expanded to include more detecthan 20,000 tons of methane, comparable to the output of the Santa Barbara seep, one of the largest geological methane sources on Earth.<\/p>\n

There is no doubt Mars once rumbled and spewed. The planet is home to the solar system\u2019s largest volcano, Olympus Mons, which is as tall as three Mount Everests. But geologists have found little evidence of activity in recent eons; the newest volcanic deposits date back millions of years. Besides, volcanoes typically give off not just methane but a host of other gases, and those have not been detected.<\/p>\n

Mumma says he stands by his data. But some scientists\u2014 Chris McKay, for example\u2014see it as highly unlikely that the Red Planet is active enough to produce methane and believe there is no explanation for its high rate of dissipation in the atmosphere. \u201cI\u2019m forced to conclude that the methane data are probably wrong,\u201d McKay says.<\/p>\n

Baross, however, is excited by the possibility that the methane results from a chemical process called serpentinization, which can provide a rich environment for life. \u201cIt\u2019s a driving force for recycling nutrients in the Earth system,\u201d he says. Cold water reacts with oxidants to crack rock, producing heat and a host of mineral compounds. \u201cIt\u2019s a really dynamic process, and if it is going on on Mars, then you may be circulating a lot of liquid water through rock.\u201d That is a purely chemical process, but it is the same one that led to the growth of slimy organisms along the Mid-Atlantic Ridge. Back on Mars, NASA\u2019s Spirit and Opportunity rovers have found evidence of minerals associated with serpentinization.<\/p>\n

The topsoil of Mars is probably dead, due to the intense radiation and extreme temperatures (\u2013195\u00b0 to 70\u00b0F), but the prospects for life look much better below the surface. Baross wants a mission that drills below the places Mumma has pinpointed as methane sources, and that goes far deeper than the drilling planned for future missions. He envisions a sophisticated robot that could do the equivalent of deep-sea drilling, boring down hundreds of meters. Only then, he believes, can scientists answer the heady question of life on Mars.<\/p>\n

For most life seekers, the ultimate goal is getting a few pounds of Martian rock back to a lab on Earth. \u201cWhat we need is a sample return,\u201d Jakosky says. NASA and ESA currently envision a joint mission to bring back the Martian goods around the middle of the next decade. But the cost\u2014possibly $8 billion\u2014 makes that a tough sell in the current economic climate. Baross is also wary of grabbing a few rocks and repeating Viking\u2019s legacy of ambiguous, yet-to-be-understood results.<\/p>\n

In the meantime, Jakosky\u2019s Mars Atmosphere and Volatile Evolution probe is slated to arrive in 2013, two years after the Mars Science Laboratory. If all goes as planned, joint European- U.S. projects will yield an orbiter ready for launch in 2016 and two rovers in 2018. None of these probes is likely to find the direct evidence of life that will settle the debate, though. \u201cMy guess is that skepticism will remain in the science community almost regardless of what is found,\u201d Schopf predicts. \u201cThat\u2019s not to say the missions won\u2019t lead us in the right direction.\u201d<\/p>\n

A slow, steady pace is just what is needed, NASA managers insist. \u201cThe key is to do careful, long-range homework,\u201d says Michael Meyer, lead scientist of NASA\u2019s Mars Exploration Program. Gathering more detailed data on surface chemistry, the history of liquid water, climate cycles, and the exact constituents of the atmosphere are critical to building a case for\u2014or against\u2014life.<\/p>\n

That approach may seem conservative to some, but it takes into account the hardlearned lessons of Viking. And it will provide the foundation for the extraordinary evidence required to support the most extraordinary of claims. \u201cThis could lead to the most stupendous discovery in the history of human existence,\u201d Schopf says, speaking with the practiced patience of a scientist. \u201cLittle steps add up.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"

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Lawler is author of three books, Under Jerusalem: The Buried History of the World\u2019s Most Contested City, The Secret Token: Myth, Obsession, and the Search for the Lost Colony of Roanoke, a national bestseller, and Why Did the Chicken Cross the World?: The Epic Saga of the Bird that Powers Civilization. As a journalist, he has written more than a thousand newspaper and magazine articles from more than two dozen countries. His byline has appeared in The New York Times, The Washington Post, National Geographic, Smithsonian, and many others. He is contributing writer for Science and contributing editor for Archaeology. 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