Mars may have had a giant ring billions of years ago, new research suggests

- The tilted orbit of one of Mars' moons was caused by the gravitational pull of a much larger moon that existed in the past, new findings suggest.
- That moon may have taken part in a phenomenon known as a moon-ring formation cycle.
- In that cycle, Mars pulled its moon so close that the moon got ripped apart, forming a giant ring. Then over time, the pieces of space dust and rock in the ring came together to reform a moon.
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Mars' two moons, Phobos and Deimos, both have wonky orbits. Phobos is about seven times larger than Deimos, and circles only about 3,700 miles above the Martian surface — the closest moon to its planet in the solar system. Deimos's orbit, meanwhile, is tilted by about two degrees.See the rest of the story at Business Insider
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