Phobos (systematic designation: Mars I) is the larger and closer of the two natural satellites of Mars. Both moons were discovered in 1877. A small irregularly shaped object with a mean radius of 11 km Phobos is seven times more massive than Mars’s outer moon Deimos. Phobos is named after the Greek god Phobos a son of Ares (Mars) and Aphrodite (Venus) which was the personification of Horror. The name Phobos is pronounced /ˈfoʊbəs/ FOH-bəs or like the Greek Φόβος.
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