This color-enhanced view of Deimos, the smaller of the two moons of Mars, was taken by the High Resolution Imaging Science Experiment (HiRISE) camera on NASA’s Mars Reconnaissance Orbiter. Deimos is about 7.5 miles in diameter. Deimos has a smooth surface due to a blanket of fragmental rock or regolith, except for the most recent impact craters. It is a dark, reddish object, very similar to Mars’ other moon, Phobos.
Image credit: NASA/JPL-Caltech/University of Arizona