A Pretty Good System

Topic: A Pretty Good System

Stephen Carter: I’m inspired by the American system. I don’t mean that America is the greatest nation on earth. It may or may not be; but I think we’ve worked out a system over time that’s actually a pretty good one; that’s a system that’s allowed to work . . . simultaneously gives a kind of safety valve to let off steam as ___________ revolution; but enables us to change over time also, but change over a measured pace. It’s very, very hard in America to do big and dramatic changes; but it’s also very hard for one group to take over and never allow any change. So we tend to change. We tend to make progress, but at the kind of measured pace that avoids a lot of backlash that we might otherwise have. I find that a very inspiring system; and we let it work, I think it tends to move us in the right direction. It doesn’t mean America’s always right. America’s often wrong, as any country is. It’s not that we are “righter” than other people. I think we have a system that’s a little bit better than others at managing change and yet allowing change to happen.

Recorded on: 7/25/07

America has developed a system that manages change well.

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Is NASA ignoring proof of Martian life from the 1970s?

One of the scientists with the Viking missions says yes.

Image source: David Williams/NASA
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  • A former NASA consultant believe his experiments on the Viking 1 and 2 landers proved the existence of living microorganisms on Mars
  • Because of other conflicting data, his experiments' results have been largely discarded.
  • Though other subsequent evidence supports their findings, he says NASA has been frustratingly disinterested in following up.

Gilbert V. Levin is clearly aggravated with NASA, frustrated by the agency's apparent unwillingness to acknowledge what he considers a fact: That NASA has had dispositive proof of living microorganisms on Mars since 1976, and a great deal of additional evidence since then. Levin is no conspiracy theorist, either. He's an engineer, a respected inventor, founder of scientific-research company Spherix, and a participant in that 1976 NASA mission. He's written an opinion piece in Scientific American that asks why NASA won't follow up on what he believes they should already know.

In 1976

Image source: NASA/JPL

Sunset at the Viking 1 site

As the developer of methods for rapidly detecting and identifying microorganisms, Levin took part in the Labeled Release (LR) experiment landed on Mars by NASA's Viking 1 and 2.

At both landing sites, the Vikings picked up samples of Mars soil, treating each with a drop of a dilute nutrient solution. This solution was tagged with radioactive carbon-14, and so if there were any microorganisms in the samples, they would metabolize it. This would lead to the production of radioactive carbon or radioactive methane. Sensors were positioned above the soil samples to detect the presence of either as signifiers of life.

At both landing sites, four positive indications of life were recorded, backed up by five controls. As a guarantee, the samples were then heated to 160°, hot enough to kill any living organisms in the soil, and then tested again. No further indicators of life were detected.

According to many, including Levin, had this test been performed on Earth, there would have been no doubt that life had been found. In fact, parallel control tests were performed on Earth on two samples known to be lifeless, one from the Moon and one from Iceland's volcanic Surtsey island, and no life was indicated.

However, on Mars, another experiment, a search for organic molecules, had been performed prior to the LR test and found nothing, leaving NASA in doubt regarding the results of the LR experiment, and concluding, according to Levin, that they'd found something imitating life, but not life itself. From there, notes Levin, "Inexplicably, over the 43 years since Viking, none of NASA's subsequent Mars landers has carried a life detection instrument to follow up on these exciting results."

Subsequent evidence

Image source: NASA

A thin coating of water ice on the rocks and soil photographed by Viking 2

Levin presents in his opinion piece 17 discoveries by subsequent Mars landers that support the results of the LR experiment. Among these:

  • Surface water sufficient to sustain microorganisms has been found on the red planet by Viking, Pathfinder, Phoenix and Curiosity.
  • The excess of carbon-13 over carbon-12 in the Martian atmosphere indicates biological activity since organisms prefer ingesting carbon-12.
  • Mars' CO2should long ago have been converted to CO by the sun's UV light, but CO2 is being regenerated, possibly by microorganisms as happens on Earth.
  • Ghost-like moving lights, resembling Earth's will-O'-the-wisps produced by spontaneous ignition of methane, have been seen and recorded on the Martian surface.
  • "No factor inimical to life has been found on Mars." This is a direct rebuttal of NASA's claim cited above.

Frustration

Image source: NASA

A technician checks the soil sampler of a Viking lander.

By 1997, Levin was convinced that NASA was wrong and set out to publish followup research supporting his conclusion. It took nearly 20 years to find a venue, he believes due to his controversial certainty that the LR experiment did indeed find life on Mars.

Levin tells phys.org, "Since I first concluded that the LR had detected life (in 1997), major juried journals had refused our publications. I and my co-Experimenter, Dr. Patricia Ann Straat, then published mainly in the astrobiology section of the SPIE Proceedings, after presenting the papers at the annual SPIE conventions. Though these were invited papers, they were largely ignored by the bulk of astrobiologists in their publications." (Staat is the author of To Mars with Love, about her experience as co-experimenter with Levin for the LR experiments.)

Finally, he and Straat decided to craft a paper that answers every objection anyone ever had to their earlier versions, finally publishing it in Astrobiology's October 2016 issue. "You may not agree with the conclusion," he says, "but you cannot disparage the steps leading there. You can say only that the steps are insufficient. But, to us, that seems a tenuous defense, since no one would refute these results had they been obtained on Earth."

Nonetheless, NASA's seeming reluctance to address the LR experiment's finding remains an issue for Levin. He and Straat have petitioned NASA to send a new LR test to the red planets, but, alas, Levin reports that "NASA has already announced that its 2020 Mars lander will not contain a life-detection test."

Physicists solve a 140-year-old mystery

Scientists discover the inner workings of an effect that will lead to a new generation of devices.

Credit: IBM
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