Oort cloud Hear it!

Oort cloud definition

Oort cloud (ôrt)

a moving mass of icy cosmic debris thought to exist in the vast region beyond Pluto and to be the source of the comets that orbit the sun

Etymology: after J. Oort (1900-92), Du astronomer

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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