Outer-planet meaning

Any of the four planets with an orbit outside the asteroid belt; Jupiter, Saturn, Uranus, or Neptune.
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Any of the four planets Jupiter, Saturn, Uranus, and Neptune, whose orbits lie outside that of Mars. The outer planets are large gas giants .
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(astronomy) Any planet of the Solar System whose orbit is located beyond the asteroid belt, i.e., any of Jupiter, Saturn, Uranus, or Neptune.
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