Mars currently has two moons orbiting it at the moment, Phobos and Deimos. They aren't particularly large but they are still caught in the gravitational pull of the red planet. They were originally just small asteroids that got separated from the asteroid presumably by the force of other asteroids hitting into them. Mars may not be a big planet but compared to Phobos, a rather small moon, it is humongous. Because of this it is like a tidal pull and the moon is being pulled into Mars. It is doomed to crash in about 100 million years, Phobos will be no more.
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