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All planets with the exception of Mercury, Venus and Pluto have their Moons (or "Satellites") which revolve around them. Each takes a definite time to complete its orbit. The period of the four largest Jupiter satellites is 2, 4, 7 and 17 days. Mars has two tiny Moons, both approximately only 10 miles in diameter. One is approximately 6,000 miles from the planet and the other 15,000 miles. Although as telescopes have become more powerful, more satellites have been discovered attached to other planets, our Moon is the Earth's only satellite.
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