Phobos (moon)

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Orbits of Phobos and Deimos (to scale), as seen from above Mars
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Orbits of Phobos and Deimos (to scale), as seen from above Mars

Phobos (or Mars I) is one of Mars' moons. The other is Deimos.

Phobos is the larger of the two moons, and is only 27 kilometers in diameter. This is about as far as a car can travel on the highway in 15 minutes. It is covered with craters, as Earth's moon is.

It is named after the god Phobos in Greek mythology.

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