minor planet

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minor planet:

see asteroidasteroid,
 planetoid,
or minor planet,
small body orbiting the sun. More than 300,000 asteroids have been identified and cataloged; more than a million are believed to exist in the main belt between Mars and Jupiter, with many more in the Kuiper belt
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.

minor planet

See asteroids; planetoids.

minor planet

[′mīn·ər ′plan·ət]
(astronomy)
Those planets smaller than the earth, specifically Mercury, Venus, Mars, and Pluto.