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NASA's Mars Science Laboratory (MSL) Curiosity rover found evidence for ancient, water-transported sediment on Mars at a few sites, including the rock outcrop pictured here, named "Hottah." Rounded pebbles within this sedimentary conglomerate indicate sustained abrasion of rock fragments within water flows that crossed Gale crater. The Mastcam image was acquired on the 39th day of the mission (Sept. 15, 2012 GMT).
Image Credit: NASA/JPL-Caltech/Malin Space Science Systems