Phobos is one of the two moons of Mars, the other being Deimos. It was discovered in 1877 by American astronomer Asaph Hall and is named after the Greek god of fear, who was the son of Ares (the Greek counterpart of Mars). Phobos is the larger and closer of the two moons, with a mean diameter of about 22.4 kilometers (13.9 miles).
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