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Etymology edit

Coined by William Herschel because of their apparent resemblance to the planet Uranus.

Pronunciation edit

  • (file)

Noun edit

 
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planetary nebula (plural planetary nebulas or planetary nebulae)

  1. (astronomy) A nebulosity surrounding a dying red giant, consisting of material expelled by the star.

Synonyms edit

  • PN (abbreviation)

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See also edit