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Mars Global Surveyor image of Mars surface rock showing angled &... News PhotoAstronomy,Color Image,Horizontal,Image,Lake,Sand,Science and Technology,Space,TIMEINCOWN,TLPConprod,TiltPhotographer Collection: The LIFE Picture Collection Time Life PicturesMars Global Surveyor image of Mars surface rock showing angled & horizontal layers hinting at water-deposited sediment that appear to be remains of lake beds. (Photo by Time Life Pictures/Malin Space Science Systems/JPL/NASA/The LIFE Picture Collection/Getty Images)