PHOTOS: The Ever-Mysterious Landscape of Mars

Scientists believe a canyon might have been a lake before Mars dried up.

The Ever-Mysterious Landscape of Mars

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The route followed by NASA's Mars Exploration Rover Opportunity from its landing site through the 1,215th Martian day (or sol) of its mission (June 24, 2007), is marked on this map. (NASA/JPL/Cornell/MSSS/Ohio State University)
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