The Mars moon Phobos
The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter took this image of the larger of Mars' two moons, Phobos, on March 23, 2008.
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The High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter took this image of the larger of Mars' two moons, Phobos, on March 23, 2008.