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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One of the last images from the orbiting Mars Global Surveyor was also one of the most intriguing. Scientists say the white streak in this picture is some sort of gully, possibly caused by liquid water spurting into a crater from an underground aquifer. Where there's flowing water, could there be the right conditions for life? (NASA/JPL)
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