Mars has two small moons, Phobos and Deimos. They are irregularly shaped and much smaller than Earth's moon. 1. **Phobos**: The larger of the two, Phobos is about 22.4 kilometers (13.9 miles) in diameter. It orbits Mars at a very close distance, completing an orbit in about 7.5 hours, which means it rises in the west and sets in the east, contrary to what we see on Earth.
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