Deimos (systematic designation: Mars II) is the smaller and outer of the two natural satellites of the planet Mars, the other being Phobos. Deimos has a mean radius of km (mi) and takes 30.3 hours to orbit Mars. The name Deimos is pronounced , or sometimes or like the Greek Δείμος}.}}[citation needed] In Greek mythology, Deimos was the twin brother of Phobos and personified terror. Deimos is km (mi) from Mars, much further than Mars's other moon, Phobos.
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