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interstellar medium - 2 dictionary results
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interstellar medium

noun
interstellar space including streams of protons moving from the stars 

WordNet® 3.0, © 2006 by Princeton University.
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Interstellar Medium
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interstellar medium   (ĭn'tər-stěl'ər)  Pronunciation Key 
Material, mostly hydrogen gas, other gases, and dust, occupying the space between the stars and providing the raw material for the formation of new stars. Nebulae are the most distinct areas of the interstellar medium; they appear when the clouds of gas and dust cluster due to interaction with nearby stars or star remnants.

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