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 image shows "Duck Bay," an alcove on the edge of Victoria Crater, where the Opportunity Rover is beginning its downhill trek. Scientists are especially interested in the bright band of soil (labeled) they see below the crater's rim. It may be leftover material from the Martian surface when a meteoroid gouged out the crater millions of years of years ago -- perhaps when Mars was warmer and wetter than it is today. This picture was taken by NASA's Mars Reconnaissance Orbiter, passing over the crater. (NASA/JPL/University of Arizona)
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