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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Scientists believe a long, deep canyon on Mars might have been an ancient lake. This is what the lake might have looked like 3.4 billion years ago before the planet dried up. Scientists believe the lake even had accompanying beaches. The lake is being called Shalbatana after the valley it was discovered in. (G. Di Achille/University of Colorado)
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