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Mars Proctor Crater

Image of Mars Proctor Crater
A CAN OF WORMS: What are the worm-like figures in this image? Believe it or not, they are large, dark sand dunes on the floor of Proctor Crater in the Southern highlands of Mars. They are composed of basaltic sand that has collected on the bottom of the crater. The interesting patterns between the dunes are likely smaller dunes or granule ripples on the crater floor. The Proctor Crater dune field may still be active today, moving in response to Martian winds. Image Credit: NASA/JPL-Caltech/University of Arizona
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