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	The Solar System Outer Planets: Realm of the Giants The region beyond the asteroid belt is the realm of the giants. Giant storm systems drift through the clouds of these big balls of gas-enveloped rock, and rings encircle each of the four planets. Each planet also has a large system of moons, some of which are intriguing worlds in their own right. More » Jupiter Jupiter is a world of superlatives.More» Saturn The planet Saturn is a delicate giant. More» Great Dates 1610 Galileo discovers four largest moons of Jupiter 1656 Christiaan Huygens discerns nature of Saturn's rings 1781 William Herschel discovers Uranus 1846 Astronomers use calculations of perturbations in Uranus' orbit to discover Neptune 1973 Pioneer 10 flies past Jupiter, becoming the first spacecraft to visit any outer planet See Also... FAQs about the solar system. Featured images about the solar system. Keywords about the solar system. Uranus To the eye alone, Uranus is a dull planet. More» Neptune Neptune might be called the mathematicians' planet. More» Explorations Explorations of the outer planets.
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