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Scientists say Mars surface appears to have water

August 4, 2011 2:03 PM EDT Scientists say the seasonal appearance of small dark lines on Mars may be melted, salty water running down slopes during the Martian summer. Five image sequences from the Newton crater and one from the Horowitz crater show the black lines appearing near the tops of slopes and then growing into scores of "streaks" that remain for months until the cold weather returns and they disappear. The images were taken over five years by the HiRISE camera aboard NASA's Mars Reconnaissance Orbiter, which circles Mars to photograph the planet. (Aug. 4) (Courtesy of NASA/JPL/University of Arizona)

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