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Examples
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"We think there's about 7 million tons of Earth soil sitting on Mars," says Nealson.
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This is a sight that few people have ever seen, says Kenneth Nealson at the University of Southern California in Los Angeles, US.
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"Life needs energy of some kind, whether it be geothermal heat, tidal energy or sunlight," says Nealson.
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Nealson is one of dozens of scientists recruited by the agency to help find if not little green men, then at least a little green spore of some sort.
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Nealson would give his soul, he says, to find a similar specimen on another world.
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But to Nealson, a microbiologist working for the National Aeronautics and Space Administration, the densely packed organic carbon in this rock represents proof positive that life existed 3.6 billion years ago on our planet.
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Nealson and his team will work with JPL's engineers to figure out where on Mars to land a half-dozen spacecraft to search for life.
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A decade from now, a craft will return some Martian rock samples for Nealson and others to analyze.
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"The real killer would be to run into life and not recognize it," says Nealson.
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"You can tell from space by looking at Earth's atmosphere that it's alive," says Nealson.
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