The larger of Mars’ two small moons, Phobos is much closer to the planet than our Moon is to Earth – only 6,000 km compared to 384,400 km. Phobos is known for its fast orbit, circling Mars three times a day. Although its appearance resembles an asteroid, Phobos’ origin remains a mystery.
Scientists believe that Phobos and its moon Deimos may have formed from material left over during the formation of Mars or after a collision with another celestial body.
Source: Ferra

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