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Thanks to unmanned probes like Voyager I and II, as well as continued use of the Hubble Space Telescope and terrestrial observatories, we now know that Jupiter, Saturn, Uranus, and Neptune all have impressive numbers of moons, with more being discovered every few years. So far, Jupiter is out front with 67 moons. Not surprising, since Jupiter is the largest of the eight true planets, and therefore has the strongest gravitational field. Well over half of these moons are captured asteroids. Four of Jupiter's moons: Io, Europa, Ganymede, and Callisto, are among the largest moons in the Solar System, in fact, Ganymede, the largest is actually larger than the planet Mercury. Saturn is in second place with 62 moons. Its largest, Titan, is the Solar System's largest moon.

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12y ago

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