Crater Gullies at 42.4°S, 158.2°W These gullies line the wall of an impact crater on Mars. NASA / JPL / MSSS This image from Mars Global Surveyor shows gullies and dunes inside a crater in Newton Basin on Mars. Patches of wintertime frost brighten the crater wall while sand dunes clump along the crater floor. NASA / JPL / Malin Space Science Systems

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