NASA HiRISE Images Released

NASA released a photograph of sand dunes on Mars taken by HiRISE. HiRISE is the most powerful camera ever sent into space.

From the HiRISE blog: There is a vast region of sand dunes at high northern latitudes on Mars. In the winter, a layer of carbon dioxide ice covers the dunes, and in the spring as the sun warms the ice it evaporates. This is a very active process, and sand dislodged from the crests of the dunes cascades down, forming dark streaks... Falling material has kicked up a small cloud of dust. The color of the ice surrounding adjacent streaks of material suggests that dust has settled on the ice at the bottom after similar events.