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A high-resolution camera mounted on NASA s Mars Reconnaissance Orbiter has snapped pictures of unusual, almost perfectly circular sand dunes on the Red Planet s surface.
NASA's Mars Reconnaissance Orbiter (MRO) spacecraft has captured unusual circles of sand dunes on the Red Planet.The dunes were snapped by MRO's High Resolution Imaging Experiment (HiRise) colour camera.While sand dunes of many shapes and sizes .