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Ring nebula

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.01 sec.
Ring nebula, planetary nebula nebula (nĕb`ylə) [Lat.
..... Click the link for more information.  in the northern constellation Lyra; cataloged as M57 or NGC 6720. It is perhaps the most famous and beautiful nebula of this type. Its name describes the appearance of the expanding shell of gas. The nebula is estimated to be more than 5,000 light-years distant.
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Fesen of the University of Colorado at Boulder started by looking at Wolf-Rayet stars surrounded by a ring nebula -- a shell of expanding gas very close to the star.
From massive star to supernova remnant by Peterson, I. / Science News
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