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Published online 30 March 2004 | Nature | doi:10.1038/news040329-5
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Methane found on Mars
Volcanoes likely source of gas.
Methane has been spotted in the atmosphere of Mars by several researchers, reigniting speculations about the possibility of life on the red planet.
On Earth, methane is a common by-product of the metabolism of single-celled organisms.
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