Indeed, orbiters, landers and rovers have all seen thin layers of water-ice frost on the Martian surface. Perhaps surprisingly, even with its very thin atmosphere, both frost and sand dunes are common on Mars. A previous image, however, shows the ground, including the dunes, covered in a thin layer of frost. The image showing the dark dunes reveals little, if any, frost on the ground. NASA spotted the unusual sand dunes while monitoring the region for seasonal changes in frost patterns. Image via NASA/ JPL-Caltech/ University of Arizona. The smaller round sand dunes are above the top edge of the larger dune field. | This context image shows the larger region around the circular sand dunes. The unnamed crater, near Renaudot Crater, is just north of Syrtis Major. The sand dunes are inside a crater in the Utopia Planitia region in the northern hemisphere. Whereas, in the original image, it is 30.3 centimeters (11.9 inches) per pixel. The resolution of the posted image is 25 centimeters (9.8 inches) per pixel. A previous image shows when the surface was covered by frost. This is part of a series of images to monitor how frost disappears in the late winter this observation appears to be free of frost. This indicates that sand generally moves to the south, but the winds may be variable. They are still slightly asymmetrical, with steep slip faces on the south ends. In this example, the dunes are almost perfectly circular, which is unusual. Sand dunes of many shapes and sizes are common on Mars. As Alfred McEwen wrote on the HiRISE website: The dark, circular dunes are along the edge of a larger field of dunes that have more irregular shapes. Last chance to get a moon phase calendar! Only a few left. The University of Arizona also published them on their HiRISE website on March 2, 2023. MRO took the images with its High-Resolution Imaging Experiment ( HiRISE) camera on November 22, 2022. On March 3, 2023, NASA shared an image from the Mars Reconnaissance Orbiter ( MRO) of sand dunes that are round. The dunes come in many different shapes and sizes. So it’s not surprising that we call Mars a desert world. Sand dunes are common on Mars, and they can be found pretty much everywhere on the planet.
How did they form? Image via NASA/ JPL-Caltech/ University of Arizona. | NASA’s Mars Reconnaissance Orbiter ( MRO) took this photo of round sand dunes on Mars on November 22, 2022.
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