Dunes in Northern Summer

This image was taken during the Martian northern summer, so there is no frost present on the dunes. The dunes closest to the base of the polar cap are long and parallel, indicating strong winds from the direction of the cap. As they get farther away from the polar cap, they start to form more crescent shaped dunes, called barchan dunes.

https://uahirise.org/hipod/PSP_009840_2745
NASA/JPL-Caltech/University of Arizona
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