The sand dunes were imaged as part of a program to see how frost melts on the Red Planet in late winter.Posted on Monday, Apr 24, 2023 8:37 PMStrange circular dunes on Mars spotted in these NASA photosTagsMarsNASAPhotographySpaceExplorationRelated Links2024-04Super-Resolution iPhone Panoramas for Vision Pro2023-10Photo competition shows a fascinating world normally invisible to the naked eye2023-07chrislgarry/Apollo-11: Original Apollo 11 Guidance Computer (AGC) source code for the command and lunar modules.2023-04Strange circular dunes on Mars spotted in these NASA photos2022-05Laowa 15mm f/4.5 Shift Lens: Perfect for Architecture Photography?