Phobos is the larger and closer of Mars’ two small moons, the other being Deimos. It is named after the Greek god Phobos (which means “fear”), a son of Ares (Mars). A small, irregularly shaped object, Phobos orbits about 9.377 km from the center of Mars, closer to its primary than any other planetary [...]
Phobos Imaged by HiRISE. Credit NASA/JPL/University of Arizona
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