Jump to October 2008 archive page: 1 2
  • The science of bloodsuckers

    Bat Conservation Int'l via AFP - Getty
    Vampire bats are the stars of Bill
    Schutt's "Dark Banquet."


    Between the "Twilight" movie and book series and HBO's "True Blood" TV series, vampires are getting a lot of exposure these days. But in biologist Bill Schutt's book, those fictional fang-wearers don't even deserve to be called vampires.

    Instead, in "Dark Banquet," Schutt focuses on the true bloodsuckers of the natural world - vampire bats, leeches, bed bugs, the dreaded candiru fish and other critters that inspire tales as macabre and mysterious as any Halloween thriller.

    "You couldn't make this stuff up," said Schutt, a professor at C.W. Post College of Long Island University and a research associate in mammalogy at the American Museum of Natural History.

    Consider, for instance, the saga of Napoleonic soldiers who sipped from lake water infested with tiny larval leeches as they crossed from Egypt to Syria in 1799: "Unbeknownst to their hosts, the creatures quickly attached themselves and began to feed," Schutt writes. "Days later the men began to take ill and medical personnel were horrified to find their patients' noses, mouths and throats carpeted by blood-engorged leeches."

    Schutt, whose specialty is the study of rare vampire bats, also takes you on a spooky tour of a guano-drenched icehouse in Trinidad, where he comes close to walking right into an elevator shaft filled with rainwater and bat droppings.

    Elsewhere in the book, he explains why leeches were once inserted into women who wanted to pose as virgins on their wedding night. ("Arguably the strangest use of leeches on record," Schutt writes.) He does a reality check on the urban legends surrounding the candiru, or Amazonian "willy fish," which is said to swim right up a person's urethra. ("Apparently, it does happen, although thankfully, occurrences are extremely rare.")

    And he tells a fascinating tale about the scariest bloodsucker of them all, a creature that lives among us and preys nightly on humans: the humble bed bug.

    The bed bug bounces back
    Bed bugs have made a comeback in urban environments, even in the tonier neighborhoods, and Schutt explains some of the reasons behind that. For one thing, residential pesticide spraying has given way to bait traps that are completely ineffective against blood-feeding bed bugs.

    Univ. of Florida via AP file
    A common bed bug is engorged
    with blood after feeding on an arm.


    Another reason is that the bugs have adapted to human behavior - just like pubic lice, their bloodsucking cousins. They've spread beyond the bedroom to new frontiers, thanks to a mobile society where the critters can hitchhike on cushions, suitcases and even clothes.

    "When people come over to your house, where do you have them throw your coats?" Schutt asked. "Right: the bed."

    As bed bugs develop resistance to the pesticides that are available for use, they become more and more invincible.

    "Within the next two or three years, bed bugs are going to elbow termites and roaches out of the way to become the No. 1 pest in the United States," Schutt told me.

    Slimy science
    Other bloodsuckers can actually be good for you. Schutt traces the rise, fall and renewed rise of leeches as a medical tool. The slimers work better than anything else for drawing off blood from a surgical site, and that's why physicians have taken advantage of the leech's talents for centuries - whether or not the use was justified.

    Viktor Korotayev / Reuters file
    A woman undergoes leech
    treatment at a Moscow laboratory.


    Leech-assisted bloodletting probably contributed to the deaths of George Washington in 1799, British poet Lord Byron in 1824 and Soviet strongman Josef Stalin in 1953. But they also contributed to the healing of John Wayne Bobbitt's widely publicized penile amputation in 1993 ... and the mending of wounds suffered by Schutt's own father in a horrendous ski-boat accident in 1973.

    "I only found out about that when I was doing the research," Schutt said.

    As you'd expect for a biologist, Schutt packs lots of scientific lore into the book, even if it doesn't have to do directly with blood-feeders. Along the way, you'll suck up some fun facts about horse evolution, bee disappearances and the crazy ideas people had about human anatomy centuries ago.

    Vampyres vs. vampires
    Now, about those bats: Schutt points out that the legends surrounding human vampires (whom he calls "vampyres," to distinguish them from the real bloodsuckers) actually predate the discovery and study of vampire bats. The first stories about vampire-bat attacks came back to Europe from South and Central America in the 15th century, and those tales became increasingly linked to the pre-existing folklore of vampyrism.

    Much has been made of the fact that the existence of true vampyres (to use Schutt's term) is mathematically impossible, because the gang-fangers would quickly turn everyone on earth into fellow vampyres. The way Schutt tells it, they're biologically impossible as well.

    Jerry Ruotolo
    Bill Schutt is the
    author of "Dark
    Banquet."


    Blood contains no fat and is largely composed of water - and for that reason, vampire bats have to drink half their weight in blood every night. They have to start peeing massive amounts even while they're feeding. With those kinds of habits, even the suavest vampyre would be romantically challenged.

    "If there were a Dracula, he'd be a really skinny guy, and he'd be eating a lot," Schutt said.

    Schutt argues that vampire bats have gotten a bad rap: Yes, the best-known species has been known to lap up human blood, but that's just because we've invaded their space. And the other two species of vampire bats have become exceedingly rare, thanks to decades of indiscriminate eradication efforts.

    "These bats are really not a problem, they rarely if ever have any encounters with humans, and they really don't do much damage with regard to economics," Schutt said. "If anyone took the time to figure it out, they could be considered threatened in some areas."

    If allowed to live, they could be even be of service to humans. "They have anticoagulants in their saliva that are remarkable and much more effective than, say, heparin," Schutt said.

    Looking beyond the medical benefits, Schutt argues that the world needs bloodsuckers - and not just for Halloween tales.

    "If you think about blood as a resource, something that is nutritious and can be fed upon, then it makes sense that there would be these diverse creatures, as different as vampire bats and leeches, and that they've evolved similar characteristics to tap into this worldwide resource," he told me. "They've carved out their own blood-feeding niche, but they're also fed upon by other creatures. If they were suddenly to disappear, there'd be some real problems."

    For more batty science, check out our roundup of the world's 10 scariest animals, some good news about Tanzania's "flying foxes," LiveScience's tale of a moldy bat mystery and Discovery.com's report on duet-singing vampire bats. Here's still more Halloween science to sink your teeth into:

    Show more
  • Lunar lander deal struck

    NASA / Odyssey Moon Ventures
    Odyssey Moon Ventures can draw upon data from
    NASA's Hover Test Vehicle prototype, shown here.


    NASA and Odyssey Moon Ventures have made a $500,000 deal for the joint development of a low-cost lunar lander for future moon missions - with the money flowing in a direction that's different from usual. Odyssey, the first team to sign up for the $30 million Google Lunar X Prize, will be paying NASA for technical support.

    Eventually, the commercial venture aims to provide the space agency with some of its data from private lunar missions - including its X Prize attempt.

    This runs counter to the usual model, in which NASA pays commercial ventures for developing and maintaining the space agency's probes. For example, Lockheed Martin was given a $145 million contract to build NASA's Mars Reconnaissance Orbiter, which is now circling the Red Planet.

    Sid Sun, project manager for the Common Spacecraft Bus collaboration at NASA's Ames Research Center, told me that the arrangement calls for Odyssey Moon to pay the space agency as much as $500,000 over the next two years. The money would be parceled out on a billable-hour basis, depending on who from NASA is involved in the project for how long.

    Sun said he hopes similar deals could be struck with other companies for the application of technologies from NASA's Common Spacecraft Bus - and that means there will be limits to the private-public collaboration.

    "We want to be able to share this design as widely as possible ... and in order to share this design with other companies, we cannot share data that's proprietary," he explained. 

    Here's the edited news release from Odyssey Moon:

    "Odyssey Moon Ventures LLC, a U.S. company developing commercial systems for lunar exploration, announced today that it has partnered with NASA for the development of a robotic lunar lander. The unique public-private partnership will combine NASA expertise with innovative approaches to commercial space systems, resulting in new industrial capabilities for the company and benefits to the American space program. 
     
    "The partnership was established through a Reimbursable Space Act Agreement signed with the NASA Ames Research Center on Oct. 30. Under the terms of the agreement, NASA will provide technical data and engineering support to Odyssey Moon Ventures in support of the company's efforts to develop its 'MoonOne' robotic lunar lander, which will have the capabilities of delivering payloads to the surface of the Moon in support of science, exploration and commerce.  In return, Odyssey Moon Ventures will reimburse NASA Ames for the cost of providing the technical support and will share its technical data from its engineering tests and actual lunar missions with NASA.

    " 'The prospect for commercial delivery of NASA science and exploration instruments to the Moon is consistent with the precedents already set by the NASA COTS program supporting commercial supply for orbital operations," said NASA Ames Research Center Director S. Pete Worden.  "Extending commercial supplier concepts and relationships to advance NASA's mandates for exploration and permanent operations on the moon is a logical next step."

    "Odyssey Moon's MoonOne lunar lander will be adapted from a small spacecraft system under development at NASA Ames called the Common Spacecraft Bus, which uses an innovative modular design adaptable to a variety of mission configurations as either an orbiter or a lander. Under the partnering agreement, NASA will share technical data and provide engineering support to Odyssey Moon Ventures.  NASA also will share data from the Hover Test Vehicle, an engineering prototype of the Common Spacecraft Bus developed at Ames to evaluate hardware and software systems through rapid prototyping and ground-based testing.

    "Earlier this year, veteran space executive Jay Honeycutt was announced as president of Odyssey Moon Ventures, responsible for all U.S. operations and programs. 'I am extremely pleased and excited to be working on getting us back to the moon in a sustainable way,' said Jay Honeycutt.  'I believe the private sector has an important role to play in a permanent and affordable lunar program.  We look forward to working with NASA as both partners and customers in this effort.'  Honeycutt has over 40 years of space program experience, including director of NASA's Kennedy Space Center and president of Lockheed Martin Space Operations.

    "Odyssey Moon Ventures will focus on the commercialization of the NASA technology to develop a series of robotic missions to the moon during the International Lunar Decade.  It's initial MoonOne lunar lander will utilize the innovative modular design of the Common Spacecraft Bus in its efforts to provide low-cost, frequent and affordable access to the moon for private, academic and government customers.

    " 'NASA Ames Research Center is developing a number of small lunar mission concepts supporting the U.S. Space Exploration Program,' said Worden. 'We are interested in the prospect of utilizing additional payload capacity on Odyssey Moon Commercial Missions of Opportunity to advance our science and technology goals.'

    "Odyssey Moon has already signed on two commercial organizations for the mission, and the company has since received proposals for payloads from customers worldwide. 'We are thrilled with the response to our MoonOne Commercial Mission of Opportunity,' said Odyssey Moon Founder and CEO Dr. Robert (Bob) Richards.  'The tremendous response from both the private sector and government agencies proves that a new value added paradigm is possible with private sector involvement in space exploration.'

    "Odyssey Moon Ventures LLC is a U.S. company with offices in Washington, D.C., and Cocoa Beach, Fla. ... In addition to working with NASA on lander development, Odyssey Moon Ventures will be responsible for the U.S. launch operations and ground processing of spacecraft that will be used in future commercial spaceflights to the moon. 

    "Odyssey Moon Limited is a multinational commercial lunar enterprise based in the Isle of Man that was first unveiled in December 2007 as the first official contender in the $30 million Google Lunar X Prize competition.  The company is an innovative partnership of aerospace, financial, science, education, legal and policy interests that have come together to offer unique commercial lunar business services and products for humanity's permanent return to the moon. Odyssey Moon's prime contractor is MDA, an experienced company with substantial space heritage in providing robotics on the space shuttle and international space station, and more recently for satellite servicing and planetary exploration. Odyssey Moon is dedicated to the long-term responsible development of the moon for the benefit of all humanity."

    NASA issued its own release about the deal, quoting Worden as saying that the space agency "is a big supporter of developing the commercial space sector."

    "By making these designs available to commercial enterprises, we hope to spark rapid development of low-cost, small spacecraft missions," he said.

  • Invasion of the brain snatchers

    House Ear Institute
    The parasite known as Toxoplasma gondii gets its microscopic close-up.

    Parasites may seem merely icky, but some of them have the Halloweenish capacity to take over your brain. Scientists have happened upon a number of neurological nuisances in the animal world, but the scariest of the lot is a tiny critter known as Toxoplasma gondii - which makes rodents, and perhaps even humans, go loco.

    Stanford neurobiologist Robert Sapolsky provided a status report on the fabled Toxoplasma and other brain snatchers this week on the university's Palo Alto campus, as part of the Council for the Advancement of Science Writing's annual New Horizons in Science seminar.

    Over the past few years, neuroscientists have used brain imaging and other high-tech tools to track exactly how the one-celled Toxo organism does its nefarious deed. The parasite can reproduce only in cat feces - but once the next generation has been spawned, how does it get into another feline host?

    That's where zombie rodents play a role: When mice or rats consume the feces, as is their wont, the Toxo protozoans migrate to the brain - specifically, to the amygdala, which is the brain's switchboard for emotional response. There they form encapsulated cysts and proceed to manipulate the wiring of the rodent brain.

    Studies have shown that the Toxo genome contains what appear to be mammalian versions of two genes that are involved in the production of dopamine, a neurotransmitter that is linked with the brain's reward system. "Toxo has evolved to take over the reward pathway," Sapolsky said.

    He and other researchers are still working to nail down the exact mechanism, but Toxo apparently targets a neural pathway that instills mice and rats with a natural fear of ... cat urine. "It's lasering out this one thing of not liking the smell of cats," Sapolsky said.

    In a long series of experiments, scientists have found that Toxo-infected rodents lose that fear of cat pee, while other fear mechanisms (for example, the fear of being in an exposed area) are unaffected. "What this damn Toxo knows how to do is make cat urine smell sexy to male rats," Sapolsky said.

    As for the female rats, "I'll bet you it makes [cat urine] smell like babies," he added.

    The result is predictable: The rats are drawn to the cats, the cats eat the rats, and the circle of life begins anew.

    So far, this sounds like some sort of hallucinogenic "Tom and Jerry" cartoon - but if Toxoplasma gondii can affect rodent brains, it can affect human brains as well. One out of every five Americans are thought to carry the parasite, and the infection rate can be higher in other parts of the world. Toxo poses such a risk to the fetal nervous system that pregnant women are advised to avoid contact with cat litter boxes.

    Although scientists are just starting to study Toxo's effects on adult humans, the initial evidence suggests that "Toxo does something to humans quite reminiscent to what it does to rats and mice," Sapolsky said. He's not talking about a sudden fondness for cat pee - rather, the organism is thought to mess with the way our brains handle rewards and impulse control.

    One study, conducted in Turkey, showed that a Toxo-infected group of drivers were two to four times more likely to be involved in traffic accidents than the experiment's control group. Another study has claimed that high rates of infection could influence an entire culture - making people more naturally neurotic, for example. One researcher has charted what he says are Toxo-linked personality differences. Others have suggested a link between the infection and schizophrenia. (Here's a scary study on the subject.)

    The bottom line is that more research is needed to pinpoint Toxo's effects on humans. "Three studies - that's the entire literature at this point," Sapolsky noted.

    The tale of Toxoplasma gondii also may spark interest in figuring out how other infections affect our zombie brains. Some researchers speculate that there's a whole class of psychiatric disorders known as PANDAS that are linked to childhood infections. Among the illnesses are obsessive-compulsive disorder, hyperactivity and Tourette's Syndrome.

    If you're still doubtful that brain invaders really exist, Sapolsky can cite a few more examples, including:

    • Hairworms that invade crickets, take over their nervous system and then order their buggy hosts to drown themselves so that the grown worm can take to the water.

    • Barnacles that latch onto male crabs and blast them with so much estrogen that they dig empty nests, made to order for the barnacle to lay its eggs inside. If the crab host happens to be a female, no problem: The barnacle merely wipes out the host's reproductive system, and then sets her digging.

    • A mind-controlling fluke known as Dicrocoelium dendriticum that makes its way through the innards of cows, and then snails, and then ants. Once the parasites are inside an ant's head, they turn the bug into a zombie. The ant repeatedly climbs up blades of grass, a type of behavior that doesn't seem to make sense ... until you realize that it makes the ant more vulnerable to being eaten by a grazing cow, where the life cycle begins again.

    To learn more about how the amygdala and other parts of your brain work, check out our interactive "road map to the mind." To learn more about zombifying parasites, check out Carl Zimmer's book, "Parasite Rex." And if all this gets you in a Halloween mood, click through this ghoulish gallery of past postings:

  • The subatomic dragstrip

    SLAC
    A technician works inside SLAC's 2-mile-long linear accelerator tunnel.

    Most atom smashers are built like racetracks, with powerful magnets bending subatomic particles into circular routes. The SLAC National Accelerator Laboratory, built in the heart of California's Silicon Valley, is something completely different: It's basically a 2-mile-long dragstrip that whips up electrons to shed light on the structure of matter.

    SLAC's straight-shot structure hints at the shape of atom smashers to come - such as the future International Linear Collider. And it makes for one heck of a jogging trail.

    "There's actually a race where they go down to the accelerator and back - it's four miles," said SLAC graduate student Chris McGuinness, who is an avid mountain climber as well as a researcher working on the next generation of laser-powered particle accelerators.

    Next month's 37th annual SLAC Run and Walk will take place outside the accelerator's housing. But at the same time, 25 feet beneath the surface, electrons and positrons will be running their own races down SLAC's straight track.

    At the end of the track, those pumped-up particles can be curled around and smashed together, or they can be captured in a magnetic ring to generate brilliant flashes of X-ray light. The smashing part has supported Nobel-winning discoveries, including this year's physics prize, but the flashing part is pointing the way to SLAC's next frontier. 

    SLAC
    The housing for the SLAC National Accelerator Laboratory's 2-mile-long tunnel
    shows up as a straight line in this aerial photo of the Silicon Valley site.

    Transition time
    SLAC is definitely in a time of transition, in part evidenced by this month's official name change: For the past 46 years, it's been known as the Stanford Linear Accelerator Center. Today, Stanford University still manages the lab on behalf of the U.S. Department of Energy, but the acronym has been incorporated into a bigger mouthful of a name to recognize SLAC's growing role in photon science and astrophysics.

    In particle physics, SLAC's signal accomplishments have focused on figuring out why matter is structured the way it is. "We did the first experiments that showed quarks existed," said Stanford graduate researcher Daniel Ratner.

    More recently, the lab's BaBar collaboration has shed light on why matter won out over antimatter, and found the lowest-energy example of weird subatomic stuff known as "bottomonium."

    But BaBar's days are numbered: As the Large Hadron Collider takes center stage in particle physics, the detector system at SLAC that yielded such fundamental research (known as the B Factory) is being closed down. That's been one of the reasons why SLAC has laid off 225 of its 1,600 employees over the past year. Budget cuts forced by Congress were another factor.

    The good news is that new projects are gaining steam: Scientists at SLAC play a key role in managing the recently launched $690 million Fermi Gamma-ray Space Telescope, and the $400 million Linac Coherent Light Source is due to come online next year.

    SLAC
    Researcher Dennis Nordlund peers at equipment used for soft X-ray imaging
    on a beamline at SLAC's Stanford Synchrotron Radiation Lightsource.

    Inside the accelerator
    SLAC's researchers provided a preview of what's ahead on Monday during a tour organized for this week's New Horizons in Science conference, which is presented annually by the Council for the Advancement of Science Writing.

    The linear accelerator itself is just the start of the journey, at least as far as electrons are concerned. Although we couldn't walk through the underground accelerator hall itself, McGuinness ushered us through the above-ground Klystron Gallery.

    Klystrons are essential elements that generate electromagnetic waves, like glorified microwave ovens. The energy from the barrel-sized klystrons at SLAC is funneled down waveguides to the accelerator, where they push the electrons faster down the track like ocean waves pushing a surfer toward shore.

    At the end of the run, magnets divert the drag-racing electrons into the places where they're put to use - for example, the Stanford Synchrotron Radiation Lightsource, or SSRL. The heart of the facility is a warehouse-sized synchrotron ring, somewhat similar to the 17-mile-round ring used for pulsing protons at the Large Hadron Collider.

    At SLAC, however, the electrons' energy isn't released by collisions. Instead, they are kept in magnetic captivity and shed their excess energy in the form of X-rays. "The only thing we're using is the energy they shed," researcher John Pople explained.

    Flashes of X-rays are focused onto a wide variety of materials, and the patterns made by diffracted X-ray light can show the molecular or even the atomic structure of the material being studied: "Soft" X-rays can probe electronic properties on a scale of less than a micron (a millionth of a meter), while shorter-wavelength, "hard" X-rays can illuminate structures on a scale of less than a nanometer (a billionth of a meter).

    "Philosophically speaking, it's a form of microscope," Pople said.

    In one of the SSRL's closetlike hutches, Pople and his assistants are using hard X-rays to map the atomic structure of materials that could someday show up in a better breed of artificial corneas. At another beamline, graduate student Eric Verploegen is using soft X-rays to look at the properties of substances being considered for spray-on circuitry. The idea is to come up with flexible, organic-based electronics that could be worked into, say, combat uniforms.

    "It's a way to understand how to design the organic transistor material you want to use," Verploegen told us.

    Farther down a hallway, at yet another beamline, Swedish-born researcher Dennis Nordlund is working on a tangle of gleaming pipes and metal foil that could do service as an electron spectrometer. The complex plumbing is supposed to create a nearly perfect vacuum inside the instrument.

    "It's the same pressure here as it is in space," he said.

    The light frontier
    If you think that's impressive, you ain't seen nothing yet. The Linac Coherent Light Source, now in the final stages of construction, will pump up electrons to such high energies that the resulting flashes of X-ray light will pack 10 gigawatts of power.

    "When it's focused, we have no known material that will stop it from burning through," Ratner said.

    New caverns have been burrowed into the sandstone on SLAC's 430-acre campus to accommodate millions of dollars' worth of beamlines and observing istruments. Right now the caverns are empty, but starting next year, the Linac Coherent Light Source will set a new standard for imaging resolution, down to 1 angstrom, or one ten-billionth of a meter. It will also provide the shortest stop-action flash ever known, lasting as little as a femtosecond - that is, one-quadrillionth of a second.

    You can think of it as an atomic-scale microscope for materials, or a flash camera capable of seeing atoms. Either way, it's a new frontier for science and technology, as important as the frontier that will be explored at the Large Hadron Collider.

    "Instead of being at the energy frontier, we can look at the light frontier," Ratner said.

    More Big Science:

  • Atom smashers at work

    CERN
    A cross-section image of the Compact Muon Solenoid charts the "splash" of
    particles entering the detector when the Large Hadron Collider's proton beam was
    steered into a collimating component in the beam line on Sept. 10, during startup.

    Europe's Large Hadron Collider is out of order until next year, but that doesn't mean the atom-smashing scientists and engineers behind the world's biggest atom smasher are taking the winter off. Last week, U.S. scientists involved in LHC research gathered at Fermilab, just outside Chicago, to talk about what has to be done between now and next spring - and what they expect to do once the collider is open for business again.

    Friday's first-ever meeting of the US-LHC Users Organization gave scores of researchers an opportunity to hear what their colleagues on experimental teams were doing, share practical tips for working at the site on the French-Swiss border, and commiserate over the electrical mishap that forced a shutdown of the LHC just days after its much-celebrated startup on Sept. 10.

    The European Organization for Nuclear Research, known by its French acronym CERN, has provided bits and pieces of information about the mishap, which began with a faulty electrical connection between magnets in the collider's underground tunnel and opened up a serious breach in the helium cooling system.

    Eric Prebys, director of the U.S. LHC Accelerator Research Program, provided more of the story: "The damage was actually profound in the tunnel," he told the Fermilab audience.

    Although pictures of the damage have not been released, Prebys noted that the cylindrical magnet systems were jolted by up to 20 inches (50 centimeters). Some of the magnets were ripped from their moorings. CERN has said that, at most, 29 of the magnets will have to be repaired, but it may be difficult to assess the full scope of what has to be done until the entire 17-mile-round (27-kilometer-round) ring system is checked out.

    "The effort that's being mounted is just heroic," Prebys said.

    The first of the magnet systems to be repaired are due to be brought up to the surface this week, Prebys said. "We're still planning for beam on May 1 or thereabouts," he said.

    Taking it slow
    The accident occurred during a test to see if the magnet system could handle the electrical load required to accelerate the LHC's twin proton beams to energies of 5 trillion electron volts, or 5 TeV. When the collider is brought back online, CERN may set a slower ramp-up schedule to reach the full energy of 7 TeV per beam, Prebys said.

    "It would surprise me personally if they go to 7 TeV in the first year," he said.

    In the meantime, experimenters are calibrating their detectors using cosmic-ray hits, and finding minor problems that need fixing. On the ATLAS detector, for example, some of the detector elements "are not working well," said Brookhaven National Laboratory's Howard Gordon, U.S. ATLAS deputy research program manager.

    "This is going to get fixed, and we're working on it," he said.

    The other major detectors - the Compact Muon Solenoid (a.k.a. CMS), ALICE and LHCb - will be ready to go as well, team representatives said.

    To-do list for discoveries
    So what will scientists see once the machine is turned on again? They told me that they don't expect to make major discoveries during the first runs. The initial collisions will be used to confirm what researchers have already found out from earlier particle-physics experiments.

    "Yesterday's discoveries are the calibrations of today," said the University of Maryland's Nicholas Hadley, U.S. CMS collaboration board chairman.

    Those calibrations will take time. "We'd be happy if we can get that part finished in a year," Hadley said. Then researchers will push out into the unknown.

    Gordon said the LHC's detectors could find evidence of microscopic black holes and extra dimensions within the first year or two - if they exist. (Scientists say the black holes would be harmless, even in the unlikely event that they're created at the LHC.)

    Solutions to another set of mysteries, having to do with supersymmetric particles and dark matter, could also come to light "in the first stage" of the experiment, Gordon said. However, the evidence for supersymmetry would come in the form of missing energy after a collision. That means scientists will have to make doubly sure that there are no faults or "blind spots" in the detector systems.

    One of the LHC's main goals is to detect the Higgs boson, sometimes called the "God Particle" because it is thought to play a central role in creating the property of particle mass. Scientists say no one should expect the Higgs to turn up in the first year's observations. "The Higgs is going to take a little bit longer, I believe," Gordon said.

    The Americans who are working on the LHC are proud of the fact that a billion TV viewers tuned in for last month's startup, beating out Britney Spears on the buzz-o-meter. But now that the hype is fading, will the public be patient during the potentially long wait for discoveries?

    "We would be much better off if we had our discoveries very soon," Hadley acknowledged. "We know this."

    Other findings from Fermilab:

    • There's been less talk lately about the race between the LHC and Fermilab's Tevatron collider to detect the Higgs boson. "It'd be great if they find the Higgs at the Tevatron," Gordon said magnanimously, "but the window of opportunity at the Tevatron is really small compared with the huge opportunity at the LHC." The Tevatron's quest to find the Higgs is the subject of "The Atom Smashers," a documentary airing next month on PBS.

    • Federal support for another big science project, the ITER experimental fusion reactor, has has been in limbo ever since Congress slashed the Energy Department's budget request last December. (The word at the meeting was that the office of Rep. Peter Visclosky, D-Ind., chairman of the House Energy and Water Development Appropriations Subcommittee, played a role in the opposition to ITER funding.) Officials said the likeliest scenario for giving the U.S. ITER effort a boost would be a supplemental appropriation early next year - replaying the way things turned out during fiscal year 2008.

    • How will science policy change after next month's presidential election? "Energy, climate - these things may change significantly. Physics probably won't," said Jean Cottam, assistant director for the physical sciences and engineering at the White House's Office of Science and Technology Policy. Cottam said the Bush administration has kept tabs on the LHC. "It actually came up at a senior staff meeting at the White House," she said, although the main topic of conversation was doomsday black holes.

    For more about the LHC, check out our special report on "The Big Bang Machine."

  • Rocket racers target space

    Rocket Racing Inc. and Armadillo Aerospace are taking their rocket-powered partnership to the next level, in a suborbital space tourism venture to be headquartered at New Mexico's Spaceport America.

    Flight testing is due to begin next year, with passenger service scheduled to start in 2010. The promised cost of a ticket: $100,000 or less.

    "The price of space is coming down to earth," Rocket Racing's co-founder and chief executive officer, Granger Whitelaw, declared.

    Today's announcement came on the same day that Texas-based Armadillo won $350,000 of NASA's money in the Northrop Grumman Lunar Lander Challenge, taking place at Las Cruces International Airport in New Mexico. Led by millionaire John Carmack, the Armadillo Aerospace team flew its rocket-powered lander prototype through a course that simulates a space mission.

    Carmack started up Armadillo Aerospace eight years ago, using part of the fortune he earned as a virtuoso programmer for "Doom" and other video games.at id Software. For years, he and his mostly-volunteer rocketeers have been working to perfect a vertical-launch rocket system - first for the Ansari X Prize, and then for the Lunar Lander Challenge.

    Armadillo has also done contract work for the Air Force, and will finish up a methane rocket project for NASA. But going forward, Carmack and his team plan to turn the focus exclusively to their ventures with Rocket Racing. "We're basically not doing any more business development," Carmack said.

    For the past eight months, Armadillo has been building and testing the engine for the racing planes to be used by the Rocket Racing League. The Armadillo-powered racer got the Federal Aviation Administration's go-ahead for exhibition flights just this month - and Carmack expects to provide a fleet of rocket planes for the league over the next year.

    The suborbital space venture ties Armadillo and Rocket Racing even more closely together.

    Rocket Racing's Whitelaw emphasized that the consortium is a work in progress. "We're not 'done,'" he told me. "There are a lot of possibilities that we're looking at."

    Rocket Racing League
    This illustration shows the current concept
    for Armadillo's suborbital spaceship. Click
    on the image for a larger version.


    The main pieces are in place, however: Armadillo is to develop a reusable, vertical-takeoff rocket ship capable of rising beyond an altitude of 62 miles (100 kilometers) - the internationally accepted boundary of outer space. The two-person-capacity vehicle would be powered by Armadillo's modular rocket engines. Carmack said an eight-engine configuration should provide ample redundancy for safe manned flight.

    Whitelaw said the ship would have a see-through passenger capsule, allowing for a "360-degree view of space." At the peak of the ascent, passengers would see the black sky of space above a curving Earth, and experience a thrilling taste of weightlessness.

    Carmack said that the first unmanned flight tests would be flown next year from the Oklahoma Spaceport, with the prototype craft descending beneath parachutes. By the time passenger flights begin, sometime in 2010, he expected Armadillo to switch to a controlled, rocket-powered descent with a parachute backup system. By that time, the locale would switch as well, to New Mexico's Spaceport America, about 40 miles (64 kilometers) north of Las Cruces.

    Rocket Racing Technology Development, a subsidiary of Rocket Racing Inc., would be responsible for financing and business management. The state of New Mexico would provide the launch facility infrastructure. Whitelaw said New Mexico would provide Rocket Racing with $3 million for infrastructure development.

    "I am honored that Rocket Racing Inc. and Armadillo Aerospace have chosen New Mexico to set up shop," New Mexico Gov. Bill Richardson said in a statement released by Rocket Racing. "Spaceport America and the state of New Mexico are proud partners, and together we are writing the next chapter of space transportation."

    A fourth partner in the venture will be responsible for marketing the space rides, taking reservations, training passengers and managing the customer experience, Whitelaw said. He said the partner is an "industry leader" in tourism, but added that he would not identify the company until the marketing plan was ready to be revealed.

    "We already have passengers," Whitelaw told me, "but I'm not going to tell you anything more."

    The target price of $100,000 is about half of what Virgin Galactic is charging for future suborbital space excursions beyond the 62-mile mark. It's comparable to the suggested price for a 38-mile-high ride in XCOR Aerospace's yet-to-be-built Lynx Mark 1 rocket plane. Those ventures are expected to start taking passengers no earlier than 2010, and more likely later.

    "I've been saying for some time that we'll end up doing this before Virgin does," Carmack said. "We'll certainly be able to undercut their price."

    In today's announcement, Rocket Racing said the suborbital spaceships could be used for more than space tourism. "Target missions include microgravity experiments, astrophysics observations, reconnaissance and high-altitude scientific and meteorological measurements," the company said.

    Carmack said he thought the venture should be able to get the required permits and licenses from the Federal Aviation Administration in time to meet the 2009-2010 development schedule. "We've been through this process," he said. But his years of chasing after the X Prize and the Lunar Lander Challenge have also taught him not to take anything for granted - especially when it comes to rockets.

    "The best-laid plans and intentions don't always end up coming out like that," he said.

    This item was last updated at 1 a.m. ET Oct. 25. To keep track of developments at the Lunar Lander Challenge, check out these blogs:

  • Postcards from space

    R. Garriott via ARISS / MAREX
    An image sent via
    amateur radio shows a
    Soyuz craft in space.


    More than 2,000 electronic postcards have been received from the international space station during video-game millionaire Richard Garriott's weeklong visit - thanks to extraterrestrial messaging systems that were built by amateurs, for amateurs (and astronauts).

    The SpaceCam1 and VC-H1 systems - developed by the MAREX ham-radio group and Amateur Radio on the International Space Station - use the space station's amateur-radio rig to scan and send TV-like images back down to Earth. They follow up on slow-scan TV experiments that go back to Russia's Mir space station, and even earlier.

    When you think of ham radio, you usually think of someone hunched over a microphone, sending their voice around the world. And that still plays a big role in the work carried on by Amateur Radio on the International Space Station, also known as ARISS. Sure, astronauts have high-tech videoconferencing tools and even Internet linkups nowadays, but ham radio provides an extra backup channel as well as a recreational means to interact with hobbyists and schoolchildren.

    Ham radio can also be used to send data, and that's where the slow-scan TV experiments come in.

    Here's an e-mail message from MAREX's Miles Mann about SpaceCam1's latest success:

    "I have an unusual hobby. I build educational projects for the Russian space program. So far, the Russians have let me build and fly four different projects in space. Three projects went onto the Russian space station Mir, and my latest project is on the international space station.  The new project is called SpaceCam1.

    "The project is simple.  Send JPG images from the international space station to Earth via amateur radio.  Use a common amateur radio frequency and let everyone see the images using free decoding software. The project worked!

    "Last weekend, on October 12, ISS commander Sergei Volkov activated my project and began sending images down to Earth.  The next day, when Richard Garriott arrived on ISS, he began using the SpaceCam1 and related SSTV hardware to send images down to Earth.  We have received over 1500 JPG images from ISS in 1 week.

    "What makes this interesting [is that] it was designed and built by a handful of volunteer amateur-radio operators and then delivered to Russia to be used on ISS.

    "Today, thousands of shortwave-listeners and amateur-radio stations around the world are seeing live JPG images coming down from ISS.

    "Richard Garriott has also been using the amateur-radio station on ISS to talk to people all around the world."

    The MAREX-MG Web site offers a selection of images sent from the international space station..

    ARISS International Chairman Frank Bauer provided the latest information on his group's project, the VC-H1 Visual Communicator. He said the use of SpaceCam1 has been limited because it "has some issues with it that keeps the radio transmitting when no image is being downlinked":

    "That is why the ARISS team worked with Richard Garriott to fly the VC-H1 and we got it certified for flight in record speed.  Another item that changes history a bit is that the first experimentation of SSTV in space did not occur on Mir a decade ago.  It occurred in July 1985 (two decades ago) on the STS-51F space shuttle mission by Tony England, W0ORE.  Tony, the second ham radio operator in space, was a good friend and colleague of Owen Garriott, Richard Garriott's father.  And the SSTV system flew on the shuttle several missions in the early 1990s and was very popular.  Actually, on one flight the morning newspaper was uplinked to the crew via SSTV!

    "To date, we have received over 2,000 images from ham radio operators around the world that have captured the SSTV downlinks from ISS and posted them to the ARISS SSTV Gallery.  And we have a volunteer team that has been working 24/7 during Richard's flight to sort these images and provide the 'best of the best.'  These can be seen on http://ariss-sstv.ssl.berkeley.edu/SSTV/ ...

    "Also, the ARISS team has provided an SSTV blog. ... This site has lots of information on the SSTV operations, particularly during Richard's flight.  And we will continue to update it when Mike Fincke uses the SSTV system."

    To keep posted on Garriott's trip back to Earth, which is scheduled to take place Thursday night, keep a watch on our space news section.

    I'm in the midst of a trip myself - a trek that includes stopovers at the Fermilab particle-physics facility in Illinois and at Stanford University in California for the CASW New Horizons in Science seminar. I'll also be spending a little personal time in Iowa.

    Over the next week, postings to the log will be dependent on time, bandwidth and news developments. Don't be surprised if I send a postcard myself every once in a while - if not from the space frontier, then at least from the science frontier.

    This posting was originally published on Oct. 21, and has been corrected and updated to reflect additional information from Frank Bauer about ARISS' work in slow-scan TV.

  • Fusion projects hang in limbo

    ORNL / ITER
    This rendering shows the proposed ITER fusion
    reactor. Click on the image for a larger version.


    The current round of financial uncertainty is coming at just the wrong time for America's largest and smallest fusion research programs.

    In its simplest form, nuclear fusion involves combining the nuclei of hydrogen atoms to produce helium atoms, plus a smidgen of energy. It's the energy reaction that powers the sun as well as hydrogen bombs. For decades, scientists have been trying to tame the process to produce what could be an abundant, high-yield power source that is less environmentally problematic than nuclear fission.

    Federal funding currently backs three strategies for fusion power:

    We will have ignition
    One of the strategies, known as inertial confinement fusion, involves blasting tiny bits of fusion fuel with focused pulses of powerful laser light. The $4 billion National Ignition Facility in California has been the focus of this strategy, and although the program has faced questions over budgets and benefits, construction seems to be on track for completion next year.

    Meanwhile, over in Britain, preparations for another inertial confinement fusion experiment called HiPER began earlier this month, with startup scheduled in the 2010-2012 time frame.

    Bottom line: Inertial confinement fusion seems to be in good shape.

    ITER up in the air
    The biggest U.S.-backed fusion venture is the ITER project, which is aimed at containing power-producing plasma in a giant magnetic vessel to be built in France. This strategy is known as magnetic confinement fusion, and it represents the most mainstream approach to commercializing fusion power. The $13 billion international project is just gearing up for its construction phase, and the experimental reactor is due to come online in 2016.

    In the beginning, ITER's name was an acronym for "International Thermonuclear Experimental Reactor." Nowadays, the preferred explanation for the name is that "iter" is Latin for "the way," and that ITER marks the way toward more plentiful energy. But for almost a year, the way has been mostly blocked for U.S. contributions to the project.

    During the fiscal year that just ended, Congress cut back the funds set aside for ITER support from $160 million to only $26 million. That forced the U.S. ITER project, headquartered at Tennessee's Oak Ridge National Laboratory, to put off consultations with the U.S. companies that could be in line to build more than $1 billion worth of components for the future reactor.

    Last month, Congress approved stopgap legislation that freezes spending at current levels until next March. That means the U.S. ITER project will have to remain in survival mode for months longer, just when other countries are ramping up their procurement procedures.

    "We were worried that India and China might not be able to fulfill their obligations, but it turns out that the U.S. may be the one that doesn't," Columbia University physicist Gerald Navratil told The Associated Press at a fusion technology meeting in Geneva last week.

    Ned Sauthoff, who heads up the U.S. ITER project, told the Knoxville News Sentinel's Frank Munger that his team will proceed with procurement on the assumption that the funding situation will get "significantly better" by April. "We've been advised by the Department of Energy we should expect a better six months" after that time, Sauthoff said.

    If the United States can't produce the promised components, other countries would have to pick up the slack. America could theoretically find itself shut out of the energy project, although ITER's Japanese chief said he is hoping that Washington will "overcome this budget situation."

    "We do need the participation of U.S. scientists and engineers," AP quoted ITER Director-General Kaname Ikeda as saying. "We hope they could make the necessary recovery early next year."

    Bottom line: Further snags could add a black mark to America's record for international science cooperation.

    Wild card in the fusion quest
    The least expensive and most speculative route to commercial fusion power involves setting up a small-scale, high-voltage cage for electrons and positive ions. The system is designed to produce fusion reactions, ion by ion, and eventually give you more power than you put in.

    This inertial electrostatic confinement approach was pioneered by the late physicist Robert Bussard, and a small team of engineers at EMC2 Fusion Development Corp. in New Mexico have been carrying on his work over the past year, reportedly backed by $1.8 million from the U.S. Navy.

    Team leader Richard Nebel told me in August that the first phase of experiments was complete, and that he was waiting for guidance from a peer-review panel and his funders on whether to proceed to the second phase.

    "We've been pretty busy, but it's the same situation," Nebel told me today. "We're kind of in a holding pattern."

    He's been able to keep the five-person team together and "doing a few things" during this holding pattern. There have been some rumblings to the effect that EMC2's results have been encouraging enough to justify pressing forward, but Nebel has declined to make a prediction about the project's future.

    Nebel worries about the same kind of budget limbo that the U.S. ITER team is worrying about, even though his budget is an order of magnitude lower. Among the factors on his mind are the change in the White House and the changes in economic circumstances.

    "The thing that usually gets hit the hardest is what they call discretionary funding," Nebel said, "and that's what we're looking at here. That'd be the biggest fear everywhere."

    Nebel said he sympathizes with U.S. ITER's troubles: "I understand their concerns. They're in turbulent times just like we are, and you don't know how this is going to go. ... I'm not a big ITER fan, but the bottom line is that we're trying to do something different from them, with different sponsors and different time lines."

    Bottom line: The fans of this low-cost fusion experiment will have to wait a while longer to see whether more federal support comes Nebel's way. But for now, EMC2's fusioneers are still hanging in there ... even if they're hanging in limbo.

    For more about the political prospects for science and technology issues, check out my Briefing Book in the Politics section.

  • A future history of Mars

    Pat Rawlings / NASA
    In the novel "Mars Life," explorers like the ones shown in this speculative artwork
    find evidence of long-gone intelligent life in the Red Planet's Tithonium Chasma.

    Over the course of more than 45 years, and through more than 115 books, Ben Bova has been chronicling space exploration as fiction and fact. But in his latest novel, "Mars Life," Bova uses facts about the Red Planet - plus facts about the blue planet we live on - to weave a tale of interplanetary politics as well as scientific discovery.

    In Bova's vision of the future, Earth's governments are struggling to cope with coastal upheavals brought on by global climate change and rising sea levels. A fundamentalist group known as New Morality is tightening its influence on political leaders and the media. A network of lunar settlements has become self-sufficient and declared its independence from Earth. And an outpost on Mars is hanging onto existence, under a management deal worked out between Navajo tribal leaders and financial backers back on Earth.

    Living under conditions much like those experienced by Antarctic researchers today, explorers on the Red Planet follow up on archaeological evidence apparently left behind by an intelligent species that was wiped out millions of years ago - and hope that the anti-Mars, anti-Darwin activists of the New Morality movement won't get their funding cut off.

    BenBova.net
    Ben Bova is president
    emeritus of the National
    Space Society and a past
    president of the Science
    Fiction Writers of America.


    When you talk with Bova, who turns 66 next month, don't expect him to stick to pure fiction. In his weekly column for the Naples Daily News, he often holds forth on political developments and how they relate to the scientific frontier. Just last weekend, in an opinion piece published by The Washington Post, he called on the next president to set up a loan guarantee program for solar power satellites.

    "You can use the powerful technology we've forged over a half-century of space exploration to solve one major down-to-Earth problem - and become the most popular president since John F. Kennedy in the process," Bova wrote.

    In a Q&A session, Bova talked about "Mars Life," solar power satellites, science, religion, politics ... the whole shebang. Here's an edited transcript:

    'Cosmic Log: Does "Mars Life" reflect the way you think the world is heading? What led you to come up with this vision for interplanetary politics as well as science?

    Ben Bova: I've been writing about the interaction of science and politics for more than 30 years. I think it's a fascinating area, full of drama, full of conflict, and full of opportunities for the future.

    Q: So do you feel that your book reflects current trends? The idea that there's a fundamentalist group that is able to pull the strings in the background, and also the idea that the concern about global warming will grow, and that governments will be turning inward to cope with that? How do you go through the process of extrapolating current trends to come up with a vision of the future? Is this a fantasia on current events, or could this be a realistic scenario for how things will develop?

    A: I'm trying to write a very realistic novel. In fact, I think of this novel as a historical novel that just hasn't happened yet. All the trends that I talk about are very much apparent today. We do have people trying to stop lines of research because they conflict with their religious views. We do have problems of climate change. And we do have people who want to explore the universe. Sometimes these various threads come into conflict.

    You can't do big science without getting involved in politics – actually, two kinds of politics: the politics within the scientific community itself, and then the interaction with the larger political world, which determines what kind of funding you might be able to get, and how far you can go with your research.

    Q: If there were some plot twists that you wanted to write into current events to move things more in the direction you'd like to see for the next 40 or 50 years, what would they be?

    A: Gosh, you're asking me to write a novel!

    Q: Yeah, you do the work for me … maybe I'll write it up! You tell me.

    A: I think climate change is a very, very real thing. It's going to affect us more and more. The political arguments over whether climate change is caused by human beings or just a natural event are beside the point. Climate change is real, it's happening, and it's going to be accelerating. So we'd be smart to do whatever we can to alleviate it.

    Tor
    "Mars Life" is a novel that touches
    upon the search for alien life as well
    as political and economic trends.


    On the other hand, we do have the technology and the drive to expand through the solar system. We have been living now for almost 20-some years in a world where not all of the human race lives on Earth. We've had people living in space stations, orbiting the earth, constantly for the past 20 years or more. We have the technology to return to the moon and begin using the resources of the moon to help make life better on earth.

    One of the things that we could do, and that I've advocated very strongly, is to build solar power satellites. Very large satellites that could collect solar energy in space, beam it back to the earth, and bring gigawatts of electrical energy to us, cleanly, without altering the atmosphere, without putting greenhouse gases into the air.

    Space technology offers us a banquet, really, an enormous harvest of resources beyond the earth.  More resources of energy and raw materials than the whole earth can provide to us. We have the tools to do this. We certainly have the need to do it. The human race is using up the earth's resources at a fearsome rate. And the novels I've been writing, like "Mars Life," are examples of how this might come to be.

    Q: Why do you think that message hasn't sunk in with the general public?

    A: People can watch the Olympics live from Beijing, and wonder what has space ever done for us? They don't realize they're seeing signals relayed by satellites. I live in Florida. We watch the weather satellites very, very closely, especially this time of year, when the hurricanes are brewing. Space technology has helped to produce the computer revolution, helped to change our lives. If you're using a GPS system, if you're unfortunate enough to have to be in an intensive-care unit in a hospital, if you'd like to go scuba diving, you are using technology derived from space. This has produced new industries, millions of new jobs, and yet people don't realize it – because the investment we make in space come out of tax dollars, but the profits we make from space go to private companies.

    So although we have profited fivefold or tenfold for every dollar we've spent on space, the bookkeeping is a little out of line.

    Q: It's a case of "what have you done for me lately," I suppose.

    A: Exactly. That's one of the reasons why I advocate building solar power satellites, so that when someone asks, "What have you done for me lately," we can say, "We've helped lower your electricity bill. We've helped to stop greenhouse warming. We've stopped the enormous debt that we pay every year to import petroleum from overseas." Some of that money goes to fund terrorists and dictators. Solar power satellites are a contribution we can make to help solve very, very real problems right here down on Main Street.

    Q: Often, when you start talking about these sorts of things, people ask why we have to put billions of dollars into these blue-sky technologies when we could be working on conservation and closer-to-the-ground energy strategies.

    A: Well, you could build solar power satellites without spending a penny of tax money. Properly run, the program would encourage private investment. The government's role, I think, would be to build a demonstration model to prove that the technology works. And then all the government has to do is back long-term loans. Private industry will come in and put up the investment, and make a profit at it. Here is a technology that can help to solve our energy problems, and our environmental problems, and create profits and new jobs. And at the same time we'll be providing the infrastructure and the technology and the trained people that will allow us to return to the moon, to explore Mars, to find out if life exists elsewhere in the universe.

    Q: Among space advocates, you can sometimes get into a discussion over whether it's worth going to the moon, or whether we should just go directly to Mars. In your novel, the moon is really the first off-world settlement that becomes totally independent of Earth. Is that why the step-by-step approach, going to the moon first, and then to Mars, would work better?

    A: I think trying to prioritize your objectives for exploration is a political ploy that has served us very poorly. Space is a frontier. It's not a set of little islands that you visit here and there. It's a frontier that you develop. If we applied that kind of reasoning to the development of our Western frontier 100 or 150 years ago, we'd still be arguing over whether we wanted to build St. Louis or Chicago. You do it all. You do all that you can, and you reap the benefits from it. The moon has enormous resources to offer us. Mars is the farther objective, and the interest in Mars is really about whether life existed there or not.

    Q: When you talk about the resources of the moon, some people focus on helium-3 as a fusion fuel – but I have a feeling you have something a little more concrete in mind.

    A: Fifty percent of the moon is oxygen. Eighty percent of all the stuff we've ever lifted off the surface of the earth and put into space is oxygen – oxygen to help fuel the rocket engines, and oxygen for crews to breathe. If you could supply oxygen for the moon for space operations, the cost of space operations would go down 20 percent or more. There's one very humble but concrete resource.

    You might get manufacturing on the moon, or manufacturing on orbit under weightless conditions. I've had guys from U.S. Steel, way back in the '60s, tell me that they could make steel alloys in weightlessness that would be much stronger and lighter than anything they could make on Earth. The reason for that is, under weightless conditions, the molten metals in the alloy mix together much more cleanly and the impurities bubble out.

    Q:  I wanted to push on and ask about Mars, because that's the central theme for the book. It's also a central theme in the search for life beyond Earth. You come up with a very intriguing scenario for an intelligent civilization that existed on Mars 65 million years ago. Experts might quibble over whether life existed on Mars 65 million years ago, or 3 billion years ago, and the idea of intelligent life is very controversial. But a lot of those scientists would bet that some sort of life did exist on Mars.

    A: And some sort of life may exist on Mars now. Here on Earth, we have vast colonies of bacteria living miles below the surface, in total darkness, under temperatures and pressures that would destroy us.  Those bacteria have probably been there since the beginning of Earth. You may have similar bacteria living underground on Mars. We know the surface of Mars is very harsh, very cold, arid, bathed in hard radiation. But half a mile or so below that surface, you may have lots of bacteria that have been living there for billions of years.

    Now, in "Mars Life," I stretch things a bit: I say that perhaps there was an intelligent species on Mars, a species that got wiped out in a giant meteor strike much as the dinosaurs on Earth were wiped out by a meteor strike. Most scientists would say that's absurd. But I would respond that you can't prove it's wrong until you go to Mars and look. I'm hoping to encourage people to get there.

    What we'll find on Mars, I think, is the fact that life is not restricted to Earth. We'll find out that life is as commonplace as rocks and stars. There are many people with very conservative religious convictions here on Earth who won't want that information brought out.  They're afraid that it contradicts their views, and therefore they'll do just about anything to stop us from going to Mars and finding out whether it's true.

    Q: That was an intriguing psychological aspect of the book – that people will find any way to avoid coming to a conclusion that doesn't fit with their pre-existing patterns. And yet, some people are still able to get out from under those restrictions and explore.

    A: To be a successful scientist, you've also got to be a successful politician. You've got to be able to get people to support you, both financially and politically. Scientists are driven to explore and find new things, and this is why they often get themselves into trouble with religious leaders. Most of these institutions that societies have created are backward-looking. They are attempts to keep tomorrow exactly the way yesterday was. If you think of religion, or of the law, or of most of our customs, we are trying to preserve the status quo. But science is always looking for new stuff. Science is always breaking the mold, finding new things, upsetting ideas. Therefore, people not only fear science, they get upset and actively try to stop it.

    You have to know how to get the support you need to do the work you want to do. It's like an artist looking for a patron: Michelangelo had to find the pope and get his support to do the art he wanted to do. Today, the patrons of the sciences, almost universally, are major national governments. Scientists have to learn how to get along with the politicians. It's an uneasy relationship. And that's what my novel "Mars Life" is about, among other things.

    Q: Are you hopeful or pessimistic about the way scientists are interacting with those other institutions in society?

    A: Oh, I'm very hopeful. If you look over the long history of the human race, we have solved much tougher problems than this. Human beings are very resourceful. I have no doubt that we will expand through the solar system. As I said before, I don't regard "Mars Life" and the other novels I've written over the past 20 or 30 years as science fiction. I see them as historical novels that haven't happened yet. So hang in for a while, and they'll come true … at least in part.

    For a nonfiction view of the setting for Bova's fictional Mars base, Tithonium Chasma, check out this satellite picture from Europe's Mars Express orbiter. For a nonfiction treatment of the subject of astrobiology, Bova recommends one of his own books, "Faint Echoes, Distant Stars." And for a nonfiction roundup of Mars news, click on over to our special section, "Return to the Red Planet."

  • Hubble weathers ups and downs

    NASA
    Engineers man their stations at the Space Telescope Operations Control Center as commands are transmitted to Hubble's command and data-handling system.

    The revival of the Hubble Space Telescope started out going "exactly as we hoped," a NASA spokesman said, but engineers had to put a hold on the operation after they saw two anomalies in electronic systems onboard the telescope.

    Hubble's science operations went on the blink last month when the main system for handling commands and data going back and forth between the telescope's instruments and the ground failed. Controllers could still send commands up to Hubble and receive diagnostic readings, but the flow of imagery that made the telescope famous was cut off.

    The sudden, unexpected snag forced the postponement of the space shuttle Atlantis' final service call, which was due for launch this week.

    To revive Hubble, engineers at NASA's Goddard Space Flight Center devised a plan to switch the flow of data from the main system that the 18-year-old telescope had always used, known as Side A, to a never-before-used backup system known as Side B. The space agency's top management gave the go-ahead for the remote-controlled switchover on Tuesday, and engineers went to work on Wednesday.

    Engineers checked out Side B for the first time on Wednesday night, NASA spokesman Ed Campion told me Thursday. "All that went exactly as we hoped, so after that, the Advanced Camera for Surveys and the Wide Field Planetary Camera 2 were retrieved out of safe mode to establish that each of them has a good working interface to Side B," he said.

    Hubble's reconfigured electronics passed that test as well. "Everything worked the way we hoped it would," Campion said. "Now we're going to send commands to begin internal exposures and calibrations of the science instruments."

    The calibration data would have been used to check that Side B was functioning just as well as Side A was before the breakdown. But that part of the operation mustn't have went as well, according to a NASA update issued Friday:

    "Activitation of the Hubble Space Telescope science instruments and resumption of science observations have been suspended following two anomalies seen in systems onboard the telescope on Thursday. All of the telescope's payloads are back in safe mode condition while engineers perform troubleshooting."

    NASA is due to provide further details later today.

    Every hiccup in Hubble's status is felt deeply by the team working to get the telescope back in business. Before the latest glitch, Susan Hendrix, a NASA spokeswoman who specializes in following Hubble operations, told me that she felt a personal stake in the telescope's ups and downs.

    "Hubble's been very near and dear to me," she told me Thursday. "It's kind of like an adopted child."

    Even if Hubble resumes science operations, the child will still have to undergo some follow-up surgery: A spare unit is currently being tested at Goddard, and if that checks out, it will likely be brought up on Atlantis for installation (along with lots of other Hubble goodies) next year. Even when the new unit is in place, Hubble data will continue to flow through the Side B electronics, and Side A would become the backup. That's in line with a common-sense rule for engineers: "If it's no longer broke, don't try fixing it again." 

    Keep up with the latest news about Hubble's revival by checking the status reports on NASA's Hubble mission page. There's even an RSS feed that you can add to your feed subscription list (along with the feed for Cosmic Log, of course). And if you need to be reminded why Hubble is worth saving, check out our space gallery and especially our audio slide show retelling "The Hubble Story."

    This is an updated version of an item that was first published at 12:36 p.m. ET Oct. 16.

  • Visualizing politics

    The Takeaway / WNYC
    An online tracker offered by "The Takeaway" radio show's Web site aggregates
    electoral-vote projections from 15 media outlets. Click on the image to learn more.

    Remember the good old days, way back in 2000, when NBC's Tim Russert showed how important "Florida! Florida! Florida!" was by scribbling on a whiteboard with a marker pen? That whiteboard is now sitting in a museum - the Smithsonian, in fact - and computer wizards are serving up a whole new set of tools for visualizing politics.

    Visualizations can cut through the myriad opinion polls to show you where Republican presidential candidate John McCain and Democratic rival Barack Obama stand in the only poll that matters - and which states could be as important this year as Florida was in 2000.

    For online users who aren't content with one source for their political prognostication, "The Takeaway" radio show offers an electoral-vote tracker that combines predictions from 15 media organizations, ranging from Fox News to the FiveThirtyEight blog. The squares for each state are proportional to the vote count, and the placement of states in the toss-up section could lead you to conclude this is the year of "Virginia! Colorado! Florida!"

    Many Eyes / IBM Research
    This bubble graphic shows relative amounts of
    federal earmarks per capita in 2008 by state. The
    bigger the circle, the higher the amount.


    That's just one illustration showing how visualizations can go beyond the numbers. Computer programs can also turn budget data into cute bubbles to show where all those nasty earmarks are going (I can see Alaska from here), and use big type to indicate which words the candidates used most often during the last presidential debate (for Obama, it was "McCain," and for McCain, it was "Obama").

    "We've seen a real surge of interest in visualizations relating to politics," Martin Wattenberg, group manager for IBM's Visual Communication Lab, told me today. "After every presidential and vice-presidential debate so far, we immediately see people uploading transcripts and applying different visualizations to get different views."

    IBM's lab lets contributors use their own charting methods to create pictures that capture the essence of a gnarly data set. But that's not the end of the process. Each graphic is accompanied by a discussion forum that allows other users to comment. After a visualization was posted comparing the size of a financial bailout to other federal spending, the discussion focused on  whether the raw numbers told the whole story.

    "It's interesting," Wattenberg said. "I feel as if visualizations often don't bring you to a conclusion, but end up starting a conversation and moving that conversation forward."

    Tapping into social networking
    There are even tools to visualize how the political chatter is shaping up: In addition to laying out the electoral maps, a relatively new Web site called Perspctv uses Venn diagrams to compare how often Obama, McCain and their running mates are mentioned in the news media, in the blogosphere and in short-form tweets on the Twitter network.

    "Generally, on a given day, the news mentions have the most overlap, followed by the blogosphere mentions," Perspctv founder Vineet Choudhary told me. "On Twitter, it's generally the least amount of overlap."

    The tweets flip through Perspctv's home page like a stock ticker of social networking. "A lot more people seem to be tuning in," Choudhary said. "It's handy to have an easy, quick consumption mechanism."

    You'll also find stats on Web traffic to the McCain and Obama Web sites, as well as Google search volume (both of which currently favor the Democrat). Choudhary said he plans to broaden his Perspctv after the election and offer Web tools that can "analyze social media on any topic."

    "I do have other things going on," he said. "However, this has definitely made me more of a political junkie."

    A doughnut of data
    Yet another visualization tool, developed by University of Utah computer scientists, lets users slice survey results into smaller demographic pieces. For example, the software can take a data set about political preferences and easily show you how the statistics break down for female voters, or black female voters, or black female voters with an income over $50,000.

    The software is called Simple Query Interface With a Radial Layout, or SQIRL ("squirrel") for short. Utah researcher Geoff Draper devised the new method as part of his Ph.D. thesis, and will be presenting his study this weekend at IEEE Visualization 2008 in Columbus, Ohio.

    "I wanted to create a way to make it easy for the masses to analyze data," Draper said in a news release about SQIRL.

    The software displays data distributions in a doughnut shape. To recalculate the breakdown for a particular demographic group, you simply drag the label for that group into the center of the doughnut. Drag in more labels, and you come up with a more highly segmented subset of the sampling group. A QuickTime video demonstrates how the software works.

    "Right now, it is an academic project," Draper said. "My goal is to get the idea out there and let other software developers incorporate our visual methods into their products. The software would be useful for news reporters to go on the air and move the icons around and show how different demographic groups voted, how they feel about certain issues."

    The pundits who follow in Tim Russert's big footsteps will no doubt find themselves juggling Twitter tweets, online SQIRLs and other high-tech politicometers instead of whiteboards. Where do you turn when you need a quick visual on the political race? (Other than our own Politics Dashboard, of course!) Feel free to pass along your favorite Web sites in a comment below.

    I want to give a big Tip o' the Log to ReadWriteWeb for Sarah Perez's posting on "5 Ways to Visualize the U.S. Elections." If you follow the links from that item, you'll eventually arrive at Pointy Haired Dilbert's posting on "Red vs. Blue: 35 Cool Visualizations on 2008 U.S. Presidential Election."

    Update for 7:55 p.m. ET: Because this is a debate night, I'll provide tonight's pre-debate political prediction market quotes, and then update this item with the post-debate numbers. Right now, the good news for McCain is that the steep drop in his share price has stabilized and even shows signs of an upturn. Here are the winner-take-all quotes, translated so that they fit a 1-to-100 probability scale. Thus, a figure of 83.2 means the market sees an 83.2 percent probability that a particular candidate will be elected president:

    • Betfair: 84.7 for Obama, 14.7 for McCain (quoted odds, 7:30 p.m.).
    • Inkling Markets: 90.06 for Obama, 9.93 for McCain (listed prices).
    • InTrade: 80 for Obama, 21.1 for McCain (closing prices).
    • Iowa Elec. Markets: 83.2 for Obama, 18 for McCain (7:30 average).
    • NewsFutures: 77 for Obama, 23 for McCain (prices at 7:55 p.m.).

    Update for 1:55 p.m. ET Oct. 16: McCain share prices have fallen:

    • Betfair: 87 for Obama, 12.8 for McCain.
    • Inkling Markets: 95.4 for Obama, 4.59 for McCain.
    • InTrade: 82.6 for Obama, 17.6 for McCain (closing prices).
    • Iowa Elec. Markets: 85 for Obama, 15.2 for McCain (1:45 average).
    • NewsFutures: 80 for Obama, 20 for McCain (prices at 1:55 p.m.)
  • Where the shuttle went wrong

    NASA
    Click for slide show: See scenes from Columbia's last mission.


    "Space Shuttle Disaster," a documentary premiering on public TV stations tonight, traces the bad decisions that led to the shuttle Columbia's fatal breakup in 2003. But this isn't just about a five-year-old tragedy: The show also demonstrates why the 27-year-old space shuttle program has turned into a dead end - and why investigators say NASA must resist the temptation to keep the space planes flying for any longer than absolutely necessary.

    "Extending the shuttle is taking unnecessary risks that could doom the whole program if there were another shuttle accident," said John Logsdon, a space historian at the National Air and Space Museum who served on the Columbia Accident Investigation Board. "Even though the shuttle has been improved since its return to flight, it's still a risky vehicle."

    If the shuttle is so risky, why was it built that way? Didn't NASA realize how risky it was? Such questions get a prime-time spotlight in "Space Shuttle Disaster," airing on PBS as part of the "Nova" documentary series.

    Close observers of the shuttle program might not find all that much new in the program. In fact, Logsdon told me this week that developments since the Columbia tragedy have served only to confirm the conclusions reached by the accident investigation board, also known as the CAIB.

    "It reflects what a comprehensive job CAIB did," Logsdon said. "I think we nailed the situation pretty well."

    The show also nails the situation well, starting with its examination of the shuttle program's historical roots. Just after 1969's historic Apollo 11 moon landing, NASA and the Nixon White House settled on a plan to build a reusable shuttle fleet and an orbiting space station for the next phase of space exploration. The idea was that the shuttle would serve as a low-cost "space truck" to bring people as well as cargo into orbit on a weekly basis, with the station serving as a jumping-off point for further exploration.

    But the development cost for the shuttle turned out to be so high that plans for the station had to be thrown into limbo. That served as an early indication that the shuttle concept wasn't as efficient or as elegant as NASA thought.

    In 1986, the Challenger explosion showed that the shuttle wasn't as safe as NASA thought, either - due to a booster design flaw that had long been ignored. The shuttle and its seven crew members were lost as a result.

    The space agency agonized over its "safety culture." It redesigned the booster O-rings and returned the shuttle fleet to service.

    A similar set of warning signs was ignored in the run-up to the 2003 Columbia tragedy,. "Space Shuttle Disaster" focuses on the shuttle fleet's problems with foam insulation debris from the external fuel tank - which was a known issue well before Columbia's final launch. Investigators concluded that a chunk of flying foam, seen in close-up views of the shuttle's ascent, blew a hole in Columbia's left wing and set the stage for the shuttle's fiery, fatal breakup 16 days later.

    During Columbia's flight, some engineers tried unsuccessfully to get a better fix on what the foam did to the shuttle. And even after Columbia's loss, some experts inside NASA didn't believe that a lightweight piece of foam could do such damage. "Space Shuttle Disaster" replays the actual tests that proved it could.

    Once again, the space agency agonized over its "safety culture." It redesigned the external fuel tank and returned the remaining shuttles to service. But this time, it also decided to retire the fleet in 2010, once construction of the international space station is complete.

    The designs for NASA's next generation of spaceships follow the safety recommendations made by the accident investigation board, Logsdon said.

    "One of our recommendations was to be sure to separate the crew-carrying from the cargo-carrying function as you go to space," he said. "The approach that's being taken for the new Vision for Space Exploration does precisely that."

    NASA's proposed Orion crew vehicle is meant to ride at the top of a rocket, where there's far less risk from flying debris. It will also have a built-in escape rocket system in case the launch goes awry. Once again, however, building the spaceship is turning out to be more expensive and time-consuming than NASA would like.

    That has led some lawmakers - including Republican presidential candidate John McCain and his Democratic rival, Barack Obama - to call on NASA to consider the option of extending the shuttle's retirement date past 2010. Some would even like to keep the shuttles flying until the Orion is ready, in the 2015 time frame.

    That would be a big mistake, Logsdon said. He pointed out that NASA has estimated the probability of losing the crew on any single post-Columbia shuttle mission at 1 in 80. Adding another 10 flights between 2010 and 2015 would obviously add to the risk of another disaster.

    That caution doesn't rule out adding one or two flights to take care of some important unfinished business, such as the delivery of the $1.5 billion Alpha Magnetic Spectrometer to the station. Right now, there's no room on the schedule for an AMS delivery, but some lawmakers want to give NASA more money to cover the cost of an extra flight.

    "Flying one or two more flights in 2011 would not bother me very much," Logsdon said.

    Looking beyond the shuttle, some space activists have suggested that commercial spaceships such as the SpaceX Dragon could help NASA fill the spaceflight gap. Logsdon said SpaceX's launch system - or Orbital Sciences' alternative, or still more spacecraft from Europe or Japan - would do a fine job for delivering cargo to the space station. But he would see cause for concern if NASA turned too hastily to unproven spaceships for crew transport.

    "There are lots of variables at play in this," he observed. "It's a wicked, complex problem, but you can't risk human lives on unproven systems."

    The best option, or the "least bad" option, would be to use those other spacecraft for cargo but continue using Russian Soyuz spaceships for crew transport, Logsdon said. Even though U.S. and Russian leaders may not see eye to eye on earthly matters, and even though NASA may wish things were different, the two nations are bound together in space for the foreseeable future.

    Would things have turned out differently if NASA had stuck with the Apollo-Saturn system for space exploration, instead of starting from scratch with the shuttle? That's a topic worth chewing on in the comments section below. Feel free also to weigh in on whether "Space Shuttle Disaster" makes an accurate diagnosis of the shuttle program's problems, and whether Dr. Logsdon's prescription is the right one. If you miss the show on TV, never fear: You can watch the whole program online starting Wednesday.

    Update for 9 p.m. ET: And now for something completely different ... NASA will air a documentary titled "50 Years of Exploration: The Golden Anniversary of NASA" on the agency's Public and Education channels at 9 p.m. ET Wednesday. Host for the 90-minute documentary is Apollo 11 moonwalker Neil Armstrong.

    The show features interviews with former senator-astronaut John Glenn, Apollo flight director Gene Kranz, science-fiction author Ray Bradbury, Nobel-winning physicist John Mather and former Presidents George H.W. Bush and Bill Clinton. "50 Years of Exploration" will be rebroadcast at 1, 5 and 9 p.m. ET on Thursday and Friday, NASA says in its TV listing. Some cable systems air NASA TV, but the most reliable way to find it is online.

    NASA TV's YouTube channel offers what appears to be a sampling of the documentary for anytime viewing.

    It's also worth mentioning that the Discovery Channel has served up some tasty footage in its documentary series "When We Left Earth: The NASA Missions." The series' six episodes, plus hours of extras, are now available on DVD.

  • Rocket racer is 'go' for show

    Mike D'Angelo / Rocket Racing League ® 
     Click for video: Watch the Armadillo-powered
     rocket plane take off for a test flight in Oklahoma.


    After mere months of development time, the Rocket Racing League's Armadillo-powered racing plane has gotten the Federal Aviation Administration's go-ahead to show its stuff in 20 places around the country.

    Don't expect to see a rocket showdown in a sky near you just yet, however: The league won't start its "exhibition season" until next year, and honest-to-goodness races are slated to begin in 2010.

    The latest chapter in the Rocket Racing League's three-year-long saga came to light today, when the league reported that it has received an experimental exhibition certificate from the FAA for its latest-generation rocket racer. The league has flown two other rocket planes before, both powered by engines from California-based XCOR Aerospace. But this year the league decided to go a different route, switching over to Texas-based Armadillo Aerospace as its engine provider.

    Armadillo's alcohol-fueled, 2,500-pound-thrust engine was installed in a Velocity XL-5 airframe and went through its first flight tests less than two months ago. The league's co-founder and chief executive officer, Granger Whitelaw, said the FAA certificate was issued last Wednesday, and he praised the agency as well as the airplane development team for moving so efficiently through the process.

    "This is a historic milestone," Whitelaw told me. "The time for this program was about eight months, which is outstanding. It's incredibly significant that we have a rocket-powered plane, a rocket-powered anything that has an experimental certificate for more than 20 venues."

    The certificate gives clearance for the plane to be flown from airports ranging from New York to California. Among the venues are:

    • Sheboygan Field as well as Oshkosh's EAA AirVenture show in Wisconsin..
    • Las Vegas, Nellis Air Force Base and the Reno Air Races in Nevada.
    • Marine Corps Air Station Miramar, Mojave Air and Space Port and Moffett Field in California.
    • Jacksonville and St. Petersburg in Florida.
    • Las Cruces International Airport in New Mexico.
    • New York Air Show at Jones Beach, Long Island.
    • Maguire Air Force Base in New Jersey.
    • Sikorsky Field in Connecticut.
    • Lake Front Airport in Detroit, Mich.
    • Caddo Mills Airport, Majors Airport in Greenville, Grayson County Airport and San Antonio in Texas.
    • Oklahoma Spaceport at Burns Flat.

    Whitelaw said eight of those venues would be selected for next year's exhibition season. "We're trying to cover as much of the breadth of motor sports enthusiasts, and of air show enthusiasts and technology enthusiasts, as we can," he said.

    He said the league's plan called for the rocket plane production line to gear up by February - with two to four planes ready to fly at the Oshkosh show next July, and as many as six planes in the air by the end of next year. "I'll probably do an event in June or July," he said. "That will probably be live-to-tape TV."

    Whitelaw also hinted that the league might be coming out next year with rocket-powered "vertical drag racers," which would shoot straight up in a contest of raw speed. Armadillo Aerospace's founder, video-game millionaire John Carmack, has long talked about setting up vertical drag racing as a new sport.

    One thing that came through in Whitelaw's comments is that he's working on an even closer relationship with Armadillo: For example, Whitelaw had at one point been talking about demonstrating the Armadillo rocket racer during next week's International Symposium for Personal and Commercial Spaceflight in Las Cruces, N.M. Now those plans are off, and Whitelaw said one reason was that Armadillo is focusing on its third bid to win a six-figure or seven-figure prize in the Northrop Grumman Lunar Lander Challenge. That contest takes place in Las Cruces right after the symposium.

    "We need to focus on winning the Lunar Lander Challenge," Whitelaw said.

    "We"? Yes, Whitelaw said "we." Does that hint at a more formal financial relationship in the future? Earlier this year, the Rocket Racing League acquired Velocity Aircraft, which is building the airframes for the rocket racers. So I had to ask Whitelaw whether a similar deal was in the works with Armadillo.

    "No comment," Whitelaw answered.

  • Life on Earth's final frontier

    G. Wanger / JCVI / G. Southam / UWO  
     The rod-shaped bacterium known as Desulforudis
     audaxviator was recovered from water collected deep
     in the Mponeng Mine in South Africa.


    A strange breed of bacteria that has been found living alone, nearly two miles underground, is just the kind of creature suited to survive far beneath the surface of Mars, scientists say.

    The rod-shaped microbe, dubbed Desulforudis audaxviator, can survive in complete darkness, without oxygen, in temperatures around 140 degrees Fahrenheit (60 degrees Celsius) - as long as it has a trickle of water flowing through radioactive rocks. It was found living under such conditions in a 1.75-mile-deep (2.8-kilometer-deep) gold mine in South Africa.

    "I would guess that an organism like this would be ideally suited for the Martian subsurface," said Princeton University microbiologist T.C. Onstott, one of the microbe's discoverers.

    The strange case of D. audaxviator, which takes its species name from a message in the Jules Verne classic "Journey to the Center of the Earth," is described in the current issue of the journal Science. The research is significant not only for what it says about the resilience of life on Earth's most extreme frontiers, but also for what it says about the prospects for finding life elsewhere in the universe, said Carl Pilcher, director of NASA's Astrobiology Institute.

    "This work is of profound importance," he told me.

    The study's lead author, biologist Dylan Chivian of Lawrence Berkeley National Laboratory, said the microbe's existence isn't the only thing surprising about the bacterium. He and his colleagues decoded all the genetic material contained in a water sample taken from the gold mine, and expected to identify multiple types of bacteria. Instead, they found that D. audaxviator was the only species represented in the sample, if you exclude what appear to be trace amounts of lab contamination.

    When scientists analyzed the microbe's 2,157 protein-coding genes, they found that it had all the machinery required to create everything it needed, including a complete set of 20 amino acids. "We ourselves can synthesize only 10," Chivian said. "We have to eat all the others."

    D. audaxviator didn't require any products from photosynthesis - which sets it apart from deep-sea organisms that live in darkness but nevertheless depend on oxygen and nutrients filtering down from above. The metabolic cycle relies on radioactive elements in the surrounding rocks to break down water molecules, providing hydrogen and sulfate for the microbes to munch on.

    "This was a microbial community that appeared to be using a source of energy that no other life on Earth had used, and that is radioactive decay," Pilcher said.

    Chivian said the species can live completely independent of any other species - and based on an analysis of chemical isotopes in the water, it has apparently been doing so for millions of years.

    "The last time any of the water saw the surface was between 3 million and 10 million years ago," he said.

    The bacteria are even equipped with tiny tails, or flagella, enabling them to move around in the water. And if times get too tough, they can turn into spores. That hardiness led Chivian to select the name "audaxviator," which is Latin for "bold traveler." The term appears in one of the clues deciphered by the main character in Jules Verne's tale: "Descende, Audax viator, et terrestre centrum attinges" - that is, "Descend, Bold traveler, and attain the center of the earth."

    Once the researchers heard the name and its etymology, "it was a head-slapper," Chivian recalled. "We said, 'That's it!'" 

    All this may make it sound as if D. audaxviator is a science-fiction plot device come true: a creature from the primordial lagoon, perhaps, or an invader from Mars. But Chivian said the genetic analysis shows that the bacterium has borrowed bits of DNA from other strains of deep-living microbes in order to boost its capabilities.

    "It's not the progenitor organism, and it's not from another planet. ... Earth is its cradle," Chivian said. Over the course of millions of years, D. audaxviator may have picked up useful pieces of genetic code from other microbial species and basically beat them at their own game.

    Onstott said the microbe's genes showed that its ancestors came from a low branch on the family tree of bacterial life - and that has implications for a deep question about life's origins: Did microbes first multiply in pools of primordial ooze sitting on Earth's surface, or did they get their start far below the surface? "Finding these deeply rooted bacterial species in the tree is consistent with the idea that life may have originated in the deep subsurface," he said.

    Onstott's analysis also hints that the radioactive rocks beneath the Martian surface could sustain such bacteria, although the metabolic rate would have to be significantly slower. "When you do the calculation, you find out that the rate of chemical recharge on Mars is about 10 times less than it is on Earth," he said.

    Ah, but how far down would you have to dig to find the hypothetical Martian cousins of D. audaxviator?

    "On Mars, it may not be as deep," Pilcher speculated. But Onstott said that the microbe would probably have to find a home under Mars' permafrost, which is thought to extend 1.2 to 3.6 miles (2 to 6 kilometers) beneath the surface. The best way to sniff out such microbes closer to the Martian surface would be to find a place where water may have erupted onto the surface - for instance, in one of the gully deposits detected by NASA's Mars orbiters.

    "The only other opportunity you'd have is if there were regions on Mars that have been identified where there were signs of recent volcanic activity," Onstott said.

    In any case, astrobiologists are anxious to find the deeper meaning of D. audaxviator's discovery.

    Chris McKay, a planetary scientist at NASA's Ames Research Center, said the research is "highly relevant to the search for life below the surface of Mars, Europa, or Enceladus."

    Pilcher said it could be relevant beyond the solar system as well, because there's "nothing unusual" about the deep-down conditions where D. audaxviator dominates. "Virtually any rocky planet is going to have those conditions at some point," he said.


    In addition to Chivian and Onstott, authors of the Science paper include Eoin Brodie, Paramvir Dehal, Todd DeSantis, Gary Andersen, Terry Hazen and Adam Arkin of Lawrence Berkeley National Laboratory; Eric Alm of the Massachusetts Institute of Technology; David Culley and Fred Brockman of Pacific Northwest National Laboratory; Thomas Gihring of Florida State University; Alla Lapidus, Stephen Lowry and Paul Richardson of the U.S. Department of Energy's Joint Genomics Institute; Li-Hung Lin of National Taiwan University; Duane Moser of the Desert Research Institute; Gordon Southam and Greg Wanger of the University of Western Ontario; and Lisa Pratt of Indiana University.

    The work was supported by the Energy Department's Office of Science and by NASA through the Indiana Princeton Tennessee Astrobiology Initiative of NASA's Astrobiology Institute.

  • Cassini's closest encounter

    NASA / JPL / SSI
    The Cassini orbiter took this picture of the Saturnian moon Enceladus taken during Thursday's flyby.


    The Cassini orbiter came through its closest-ever encounter with a Saturnian moon with flying colors - and with a fresh crop of cool black-and-white pictures of Enceladus. The most precious products of Thursday's 16-mile-high pass weren't the pictures, but the samplings of the mysterious stuff welling up from the cracks in Enceladus' icy surface.

    "One of the key goals of this flyby seems to have been successful," Cassini project scientist Robert Pappalardo told me today.

    The big reason why the 22-foot-high (6.8-meter-high) spacecraft came so close to Enceladus (25 kilometers, for the metrically inclined) was to collect samples of dust and other material given off by the moon.

    Past flybys confirmed that water ice crystals and even organic molecules were emanating from geysers on the surface. During Thursday's encounter, scientists wanted to get closer-in samples, in hopes of pinpointing which materials were coming from where. Cassini's dust analyzer is tailor-made for such observations.

    Due to a software glitch, "this particular instrument had a little bit of a hiccup the last time we tried to make this measurement," said Pappalardo, a planetary scientist at NASA's Jet Propulsion Laboratory. But the detector apparently worked like a charm this week.

    "The spacecraft has detected individual peaks associated with the individual jets it flew over," Pappalardo said.

    He compared the plume of ice and other materials to a hand reaching out from Enceladus itself. "Instead of seeing the 'fist,' we're seeing the fingers now," he said.

    The dust analyzer should be able to tell scientists more precisely what's inside the jets of material given off by the geysers. It's tempting to think that the results could point to a "smoking gun" for life beneath Enceladus' surface - but that's a tall order. For now, Pappalardo is just happy to hear that Cassini has done its part.

    "There is data in hand now," he said.

    There are pictures in hand as well, and some of them have already been posted to the Cassini imaging team's Web site.

    "The imaging team acquired fabulous images," Carolyn Porco of the Colorado-based Space Science Institute said in an e-mailed status report, "and the instruments designed to collect and measure the constituents of the plume for analysis did what they should."

    In a follow-up phone call, Porco told me that close-up images weren't the primary objective for this week's flyby. The picture resolution was about 200 meters per pixel, compared with an ultra-sharp resolution of as little as 8 meters per pixel for the pictures taken during August's flyby.

    Nevertheless, the raw black-and-white images provide another good look at the moon's cracked and craggy surface. And the next flyby, a 122-mile-high (197-kilometer-high) pass scheduled for Oct. 31, should serve up some tasty Halloween treats for Porco and her team.

    "That one is designed for imaging," she said.

Jump to October 2008 archive page: 1 2