Moving Rippled Dune-Front in Hershel Crater (Enhanced Absolute Natural Colors; credits for the additional process. and color.: Dr Paolo C. Fienga - Lunexit Team)

A Rippled Dune-Front in Herschel Crater on Mars moved about 2 meters (such as about 2 yards) between March 3rd, 2007 and December 1st, 2010. Herschel Crater is located just South of the Equator in the Cratered Highlands.
This is one of several sites where the orbiter has observed shifting Sand Dunes and Ripples. Previously, scientists thought sand on Mars was mostly immobile. It took the mission's High Resolution Imaging Science Experiment (HiRISE) to take sharp enough images to finally see the movement. While Dust is easily blown around the Red Planet, its thin Atmosphere means that strong Winds are required to move Grains of Sand.