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Meaning of PLANETARY NEBULA

Pronunciation:  'plani`teree'nebyulu

 
WordNet Dictionary
 
 Definition: 
[n]  a nebula that was once thought to be a star with its planets but is now thought to be a very hot star surrounded by an expanding envelope of ionized gases that emit a fluorescent glow because of intense radiation from the star
 
 See Also: nebula

 

 

 

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