NASA's Mars Reconnaissance Orbiter has captured a stunning image of sand dunes near the planet's north polar ice cap. The High-Resolution Imaging Science Experiment (HiRISE) camera, operated by University of Arizona scientists, took the photo on September 1, 2008, and was recently reshared. The image shows parallel dunes closest to the ice cap and crescent-shaped dunes farther away, formed by strong polar winds.

Source: https://www.livescience.com/space/mars/space-photo-of-the-week-stunning-sand-dunes-slash-across-mars-polar-ice-cap