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Phobos (systematic designation: Mars I) is the larger and inner of the two natural satellites of Mars, the other being Deimos. Both moons were discovered in 1877 by American astronomer Asaph Hall.Phobos is a small, irregularly shaped object with a mean radius of 11 km, and is seven times more massive than Deimos, Mars's outer moon. Phobos is named after the Greek god Phobos, a son of Ares (Mars) and Aphrodite (Venus) which was the personification of Horror.

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  • Phobos (systematic designation: Mars I) is the larger and inner of the two natural satellites of Mars, the other being Deimos. Both moons were discovered in 1877 by American astronomer Asaph Hall.Phobos is a small, irregularly shaped object with a mean radius of 11 km, and is seven times more massive than Deimos, Mars's outer moon. Phobos is named after the Greek god Phobos, a son of Ares (Mars) and Aphrodite (Venus) which was the personification of Horror.
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  • Phobos
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  • J2000
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  • Mars I
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