These dark streaks, also known as "slope streaks," on Mars resulted from dust avalanches. They were captured by NASA's Mars Reconnaissance Orbiter using its High-Resolution Imaging Science Experiment (HiRISE) camera on Dec. 26, 2017.

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