- Phobos is the innermost and larger 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 seven times as massive as the outer moon, Deimos.
- Phobos is largely believed to be made up of carbonaceous chondrites.
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