planetary nebula
English Thesaurus
1. 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 (noun.object)
| hypernym | : | nebula, |
| definition | : | an immense cloud of gas (mainly hydrogen) and dust in interstellar space (noun.object) |
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