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Spirit, one of the Mars rovers, accidentally kicked up some dust with its unsteady wheel the other day, and revealed a possible history of water-saturated land on Mars. The wheel-kick laid bare some white sand deposits whose mineral composition is nearly pure silica — the kind of thing normally left behind by hot springs. Image via NASA. [PhysOrg]
More Evidence for Water on Mars
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2:18 PM on Tue Dec 11 2007
By Annalee Newitz
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