#PPOD: Though #Mars is the Red Planet, false-color images can help us learn about its weather and geology. This image shows various wind-related features on the Red Planet near the center of Gamboa Crater. Larger sand dunes form sinuous crests and individual domes. There are tiny ripples on the tops of the dunes, only several feet from crest to crest. These merge into larger mega-ripples about 30 feet apart that radiate outward from the dunes. Credit: NASA/JPL-Caltech/University of Arizona
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