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protoplanetary disk

[ prō′tə-plănĭ-tĕr′ē ]
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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.

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The verb tenses can be split into which 3 primary categories?

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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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