Science Focus
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NASA has revealed that a whiff of methane has been detected twice in the last couple of years at the Martian surface by the Curiosity Rover.
The source of the methane is uncertain. It is not even clear if the methane originated on Mars or arrived there by way of a meteorite that landed on the surface of the red planet, but this is the strongest evidence yet of possible life in its ancient past.
"We have full confidence that there is methane in the atmosphere of Mars," announced John Grotzinger of CalTech, a Curiosity project scientist, on December 16. "Life is one of the few hypotheses for...
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» see original post http://theweek.com/article/index/273790/curiosity-catches-a-whiff-of-methane-on-mars--and-a-possibility-of-past-life
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