Martian gullies, MRO image

Martian gullies, MRO image

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Credit: NASA/JPL-Caltech/Univ. of Arizona/SCIENCE PHOTO LIBRARY

Caption: Martian gullies. Enhanced-colour satellite image showing gullies in the northern wall of an unnamed crater in the Utopia Planitia impact basin, on the surface of Mars. The banked sinuous shape of the gully channels suggest that water was involved in their formation. The source of this water however is a subject of debate. Hypotheses include melting of snow or near-surface ground ice. Imaged by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter (MRO) satellite.

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