Mars. This image shows a portion of a large lobate debris apron along the bottom of a hill in the Tempe Terra/Mareotis Fossae region of Mars. The flow behavior described here is similar to slow-moving glacial or permafrost features on Earth. The debris apron in the upper left of the image also has several subtle 'ridge' features on its surface from low sun illumination. The ridges are roughly parallel to the base of the hill and their shapes mimic one another along their lengths. Ridges such as these may indicate a change in the climate or local environment that would have implications for our overall understanding of the Martian climate.