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noun, Astronomy.
any of the four planets with orbits outside the orbit of Mars, namely, the planets Jupiter, Saturn, Uranus, and Neptune.
any of the planets Jupiter, Saturn, Uranus, Neptune, and (formerly) Pluto, whose orbit lies outside the asteroid belt
outer planet
Any of the five planets Jupiter, Saturn, Uranus, Neptune, and Pluto, whose orbits lie outside that of Mars. With the exception of Pluto, the outer planets are large gas giants. Compare inner planet. See also superior planet.


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