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Salty Sea Covered Part of Mars: ‘Excellent’ Site to Search for Past Life Space.com

A salty sea once washed over the plains of Mars at the Opportunity rover’s landing site, creating a life-friendly environment more earthlike than any known on another world, NASA scientists announced today. The rover found evidence for the shores of a large body of surface water that contained currents, which left their marks in rocks that developed at the bottom of the sea. Opportunity found a distinct chemical makeup in the rocks and unique layering patterns that must have been generated by slow-moving water in an evaporating sea, researchers said.