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spiral nebula

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spiral nebula

–noun Astronomy.
(formerly) a spiral galaxy.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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spiral nebula

noun
a galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the center [syn: spiral galaxy
WordNet® 3.0, © 2006 by Princeton University.
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