This image acquired on August 1, 2018 by NASAs Mars Reconnaissance Orbiter, shows unusual terrain for the South Polar region of Mars, with a set of curved ridges of unknown origin.

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This terrain is unusual for the South Polar region of Mars, with a set of curved ridges of unknown origin.

Small pits are present, often concentrated on the ridges, that may have resulted from sublimation of ice.

The map is projected here at a scale of 25 centimeters (9.8 inches) per pixel. [The original image scale is 24.5 centimeters (9.6 inches) per pixel (with 1 x 1 binning); objects on the order of 73 centimeters (28.7 inches) across are resolved.] North is up.

The University of Arizona, Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., Boulder, Colorado. NASA's Jet Propulsion Laboratory, a division of Caltech in Pasadena, California, manages the Mars Reconnaissance Orbiter Project for NASA's Science Mission Directorate, Washington.

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