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ring nebula

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Ring Nebula

–noun Astronomy.
a planetary nebula in the constellation Lyra that has a ringlike appearance surrounding its central star.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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Ring Nebula   (rĭng)   
n.  A planetary nebula in the constellation Lyra.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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