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Dictionary

plan•e•tes•i•mal

Pronunciation: (plan"i-tes'u-mul), [key] Astron.

—n.
one of the small celestial bodies that, according to one theory (planetes'imal hypoth'esis), were fused together to form the planets of the solar system.

—adj.
of or pertaining to a planetesimal or planetesimals.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

planetary precession

planet gear

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