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 Opportunity during its exploration partway around the rim of Victoria Crater is marked on this map. The rover first reached the edge of the crater on it's 951st Martian day, or sol (Sept. 26, 2006). This map shows travels through sol 1,215 (June 24, 2007). (NASA/JPL/Cornell/University of Arizona/Ohio State University)
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