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Phobos And Deimos

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Mars has two moons: Phobos and Deimos. They are among the smallest in the solar system. Phobos has 1000 times less gravitational force than the Earth and orbits Mars three times a day while the Deimos is more distant away, orbiting the Mars every 30 hours. Phobos orbits only 6000 km above the surface of the planet and is gradually moving inward at 1.8 m closer to the surface each century. It is expected that in the next 50 million years, gravitational force will break apart Phobos, leading to the formation of a ring that would last 100 million years.

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