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Kuiper belt object

noun Abbr. KBO
Any of the small icy bodies orbiting the sun in the Kuiper belt, generally having a diameter less than Pluto's. Pluto is a large Kuiper belt object that was probably captured in its present solar orbit by an encounter with the planet Neptune.

Origin:

Origin: After Gerard Kuiper (1905-1973), Dutch-born American astronomer who speculated about the existence of such bodies

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