There seems to be a never-ending flow of stunning images coming from the High Resolution Imaging Science Experiment (HiRISE) on board NASA's Mars Reconnaissance Orbiter (MRO). In today's high-resolution look at the Martian surface, large flat-topped hills (a.k.a. mesas) can be seen to be eroded by the Mars winds, stripping them of their material, creating sand dunes downwind. Written by Ian O'Neill http://www.universetoday.com/2008/04/11/mars-mesas-stripped-of-sand-forming-dunes-amazing-images-from-hirise/
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