Martian valley, MRO image

Martian valley, MRO image

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

Caption: Martian valley. Satellite image showing a portion of a long valley system in northern Arabia Terra, on the surface of Mars. This valley must be relatively young as it cuts through the ejecta of an impact crater that still retains it entire ejecta blanket, indicating the crater is also fairly young and fresh. The valley is interesting as it transitions to an inverted channel near its end point. Inverted channels form when a valley fills with materials. Later, erosion removes the surrounding terrain leaving behind higher standing and more resistant material that filled the valley. Imaged by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter (MRO) satellite.

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