New Evidence of a Watery Past on Mars

Rock Formations Suggest Region Once Drenched in H20

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A closeup of a rock outcrop on Mars' Meridiani Planum.

A closeup of a rock outcrop on Mars' Meridiani Planum. Scientists say the texture and composition of the rocks in this region suggests it was once drenched in water. NASA/JPL/US Geological Survey hide caption

toggle caption NASA/JPL/US Geological Survey

NASA says it's found new evidence that water may have once flowed on the Red Planet. Scientists studying samples of rock analyzed by the Mars rover Opportunity say they see chemical signs of contact with water. NPR's Joe Palca reports.



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