Here’s an intriguing image of a dune-filled crater on the edge of a plateau on Mars, taken by the HiRISE camera aboard the Mars Reconnaissance Orbiter on April 27, 2010. The heavily-eroded face of the plateau is the result of millennia of wind erosion, which most likely provided the source of the material which has accumulated into the windswept dunes.
Read more about this image on the HiRISE site here.
Image credit: NASA/JPL/University of Arizona
Lights in the Dark 