Formed by harsh winds, fans and ribbons of dark sand dunes creep across the floor of the Bunge Crater in this image, taken in January 2006 by the Thermal Emission Imaging System instrument on NASA's Mars Odyssey orbiter.
July 31, 2012 8:23 AM PDT
Photo by: NASA/JPL-Caltech/ASU
| Caption by: James Martin
Conversation powered by Livefyre