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Mars Space Science

Martian Methane May Be Created By Lifeforms 297

Following our recent discussions about the growing evidence pointing to possible life on Mars, reader skywatcher2501 writes with news of a study that has ruled out one possible explanation for the levels of methane seen on that planet — that it might be replenished by disintegrating meteors entering the atmosphere. So two theories remain: either the gas is created as a by-product of reactions between volcanic rock and water, or it is a by-product of a lifeform's metabolism.
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Martian Methane May Be Created By Lifeforms

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Be careful when a loop exits to the same place from side and bottom.