| planets | Heavenly bodies with their own motion among the stars, revolving, in the case of the solar system, around the sun, along the plane of the ecliptic. They are grouped into inner planets and outer planets, based on distance from the sun and common characteristics. (12 Dec 1998) |
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| minor planets | Small solar system planetary bodies including asteroids. most asteroids are found within the gap lying between the orbits of mars and jupiter. (12 Dec 1998) |
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