PLANETARY NEBULA

Pronunciation (US):

(GB):

 I. (noun) 

Sense 1

Meaning:

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

Classified under:

Nouns denoting natural objects (not man-made)

Hypernyms ("planetary nebula" is a kind of...):

nebula (an immense cloud of gas (mainly hydrogen) and dust in interstellar space)

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