SUMMARY: This image is of a region of Mars called Tithonium Chasma, which is at the western end of the enormous Valles Marineris Canyon system. The whole canyon system was created through a combination of geologic factors, including tectonic rifting, water, and wind action, volcanism, and glaciers. The canyon floors have a dark, layered material, which is probably sedimentary material, though it's still under much speculation from scientists. The picture was taken by the European Space Agency's Mars Express spacecraft.
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