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protoplanetary disk
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1 dictionary results for: Protoplanetary disk
The American Heritage Science Dictionary - Cite This Source - Share This
protoplanetary disk       (prō'tə-plān'ĭ-těr'ē)  Pronunciation Key 
A rotating disk of dust and gas that surrounds the core of a developing solar system. It may eventually develop into orbiting celestial bodies such as planets and asteroids. See more at planetesimal.

The American Heritage® Science Dictionary
Copyright © 2002 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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