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Frosted Gullies

This image, acquired on December 27, 2019 by NASA's Mars Reconnaissance Orbiter, shows gullies on Mars during the winter, fluidized by carbon dioxide frost.
PIA23675
Credits: NASA/JPL-Caltech/University of Arizona
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Description

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Gullies on Mars form during the winter, fluidized by carbon dioxide frost, so we monitor these sites for activity throughout the year.

This mid-winter scene is almost completely frosted over the pole-facing slope within the shadow.

The map is projected here at a scale of 50 centimeters (19.7 inches) per pixel. (The original image scale is 50.5 centimeters [19.9 inches] per pixel [with 2 x 2 binning]; objects on the order of 152 centimeters [59.8 inches] across are resolved.) North is up.

The University of Arizona, in Tucson, operates HiRISE, which was built by Ball Aerospace & Technologies Corp., in 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.