NASA / JPL-CALTECH / U.ARIZONA / SCIENCE PHOTO LIBRARY NASA / JPL-CALTECH / U.ARIZONA / SCIENCE PHOTO LIBRARY
Frozen Mars. Satellite image showing the scarp that demarcates the boundary between layered deposits covering the north polar region (blue, top) and the lower surrounding terrain, which includes sand dunes. This image was taken in the Martian spring and it is still cold enough for white carbon dioxide frost to cover most of the area. Imaged by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter.
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