See also "Dwarf Planet", a TOS comic.

A dwarf planet is a planetary body found in a star system with sufficient mass to make it spheroid, but with insufficient effect on other bodies in it's orbit to clear the neighborhood of other bodies. Bodies which can clear the neighborhood are known as planets, while planetoids are another small planet like body comparable to dwarf planets.

The ninth planet in the Sol system, Pluto, was classified as a dwarf planet in the year 2006. For over three hundred years to follow, its classification switched between planet and dwarf planet ten or more times. Pluto had once more been reclassified as a planet shortly before it was absorbed and destroyed by a Borg cube in 2380. (TNG novel: Before Dishonor)

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Galactic regions: quadrantsectorclusternebulastar system
System bodies: starplanetplanetoiddwarf planetasteroidmeteoroidcomet

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