In Mars' Wirtz Crater, these dunes are likely active, with ripples on their upwind slopes and dark streaks on their downwind slopes forming and changing due to wind-driven sand motion. Color has been enhanced to highlight the dunes. This motion will also keep the dune brink (the edge between the two slopes) and bottom edges sharply defined. The dark lines and squiggles on the dune slope are formed by passing dust devils. Image Credit: NASA/JPL-Caltech/University of Arizona
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