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protoplanetary disk

protoplanetary disk in Science
protoplanetary disk
  (prō'tə-plān'ĭ-těr'ē)   
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. Published by Houghton Mifflin. All rights reserved.
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