| / English Dictionary |
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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