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Sushil K. Atreya & Christopher R. Webster

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    There’s Mysteriously Large Amounts of Methane on Mars

    The mystery isn’t just that we see methane when we shouldn’t. It’s also that, in a sense, we see too much of it. If you want to detect life on another planet, look for biomarkers—spectroscopic signatures of chemicals that betray the activity of living things. And in fact we may have already found a biomarker. […]