Definition: Meaning of, planetary nebula in English to English dictionary.
Pronunciation:/ ˈplanɪt(ə)ri ˈnɛbjʊlə /
noun
synonym
antonym
Word Forms:
Singular
Plural
planetary nebula
planetary nebulae
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