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Planetary nebula

noun

Definitions

Noun
  1. 1
    A nebulosity surrounding a dying red giant, consisting of material expelled by the star.
  2. 2
    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 wordnet

Etymology

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

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