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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This computer-generated image shows the Mars rover Opportunity as it explores the surface of the red planet. Is trying to get into a deep crater, called Victoria, in July 2007. Scientists say rocks along the crater's sides may have been exposed millions of years ago when a meteoroid gouged out the crater, and hold clues to Mars' wet past. . (NASA)
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