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Published online 2 June 2005 | Nature | doi:10.1038/news050531-10
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Martian methane could come from rocks
Olivine is enough to explain 'whiff of life', claim geologists.
The methane in Mars's atmosphere could easily be produced by mineral chemistry, rather than life. That's the claim from a pair of geologists whose calculations suggest that some experts have been too quick to assume a bacterial source for the gas.
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