| outer planet | | |
| n. | 1. outer planet | (astronomy) a major planet whose orbit is outside the asteroid belt (Jupiter, Saturn, Uranus, Neptune, Pluto). |
| ~ astronomy, uranology | the branch of physics that studies celestial bodies and the universe as a whole. |
| ~ jupiter | the largest planet and the 5th from the sun; has many satellites and is one of the brightest objects in the night sky. |
| ~ neptune | a giant planet with a ring of ice particles; the 8th planet from the sun is the most remote of the gas giants.; "the existence of Neptune was predicted from perturbations in the orbit of Uranus and it was then identified in 1846" |
| ~ major planet, planet | (astronomy) any of the nine large celestial bodies in the solar system that revolve around the sun and shine by reflected light; Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto in order of their proximity to the sun; viewed from the constellation Hercules, all the planets rotate around the sun in a counterclockwise direction. |
| ~ pluto | a small planet and the farthest known planet from the sun; it has the most elliptical orbit of all the planets.; "Pluto was discovered by Clyde Tombaugh in 1930" |
| ~ saturn | a giant planet that is surrounded by three planar concentric rings of ice particles; the 6th planet from the sun. |
| ~ solar system | the sun with the celestial bodies that revolve around it in its gravitational field. |
| ~ uranus | a giant planet with a ring of ice particles; the 7th planet from the sun has a blue-green color and many satellites.; "Uranus was discovered by William Herschel in 1781" |
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