Defrosting Dunes in Kaiser Crater

The dark sand dune at the center of this observation is covered in a blanket of white seasonal ice in the winter. In this Martian springtime image, the western slope of the dune is partly defrosted. Bright patches of frost (white in enhanced color) are clearly visible and are made up of water and carbon dioxide ices. Dark streaks of sand have flowed down the dune's slope that sometimes covers the frost.