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planetary nebula

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1. n. 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: wordnet

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star thought planets because emit envelope expanding fluorescent gases glow hot intense ionized nebula now once radiation surrounded

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planet-stricken planet-struck planetal planetaries planetarium planetariums

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