English dictionary
planetary nebula meaning and definition
Definition and meaning of planetary nebula at MeaningMonkey.org. planetary nebula meaning and definition in the English Dictionary.PLANETARY NEBULA noun
Definition of planetary nebula (noun)
- 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
Source: Princeton University Wordnet