Dark, windblown silt covers perplexing sedimentary stone layers in this picture prisoner by NASA’s Mars Reconnaissance Orbiter (MRO) from Ganges Chasma, a ravine in a Valles Marineris system.
These facilities are during once informed and surprising to those informed with Earth’s beaches and deserts. Most silt dunes on Earth are done of silica-rich sand, giving them a light color; these Martian dunes owe their dim tone to a iron and magnesium-rich silt found in a region.
The map is projected here during a scale of 25 centimeters (9.8 inches) per pixel. [The strange picture scale is 26.7 centimeters (10.5 inches) per pixel (with 1 x 1 binning); objects on a sequence of 80 centimeters (31.5 inches) opposite are resolved.] North is up.
The University of Arizona, Tucson, operates HiRISE, that was built by Ball Aerospace Technologies Corp., Boulder, Colo. NASA’s Jet Propulsion Laboratory, a multiplication of Caltech in Pasadena, California, manages a Mars Reconnaissance Orbiter Project for NASA’s Science Mission Directorate, Washington.
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