NASA / JPL-CALTECH / UNIV. OF ARIZONA / SCIENCE PHOTO LIBRARY NASA / JPL-CALTECH / UNIV. OF ARIZONA / SCIENCE PHOTO LIBRARY
Frost on Mars. Satellite image of frost accumulation on gullies on the surface of Mars. This frost is carbon dioxide ice that often sublimates (going directly from a solid to a gas) during the Martian spring. Imaged by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter (MRO) satellite, in late winter.
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