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 rover's view of the edge of Victoria crater on Mars. The floor of the crater is about 50 feet down. Opportunity been exploring a level plain called Meridiani Planum. A crater like this allows it to examine the layers of rock below. (NASA)
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