It extends back to last year and looks like the sort of mystery that'll keep scientists scratching their heads for years to come.
The air of Mars seems to contain pockets of methane in doses that should not exist. Perhaps it's the belchings of subsurface microbes. They support that view with new evidence for blocks of underground ice in the same region as the methane, based on observations by ESA's Mars Express.
The ice could be supplying the precious liquid water needed to support the biology, they figure. Other astronomers think the reasoning is very speculative, however.
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