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New Evidence of a Watery Past on Mars

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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Joe Palca is a science correspondent for NPR. Since joining NPR in 1992, Palca has covered a range of science topics — everything from biomedical research to astronomy. He is currently focused on the eponymous series, "Joe's Big Idea." Stories in the series explore the minds and motivations of scientists and inventors. Palca is also the founder of NPR Scicommers – A science communication collective.