planetary nebula definition

  • noun:
    • A nebula, for instance the Ring Nebula, composed of a hot, blue-white, central celebrity enclosed by an envelope of growing gas.
    • A nebulosity surrounding a dying star, consisting of material expelled by the star.
    • a nebula which was once regarded as a star using its planets but is today considered a really hot star in the middle of an expanding envelope of ionized fumes that produce a fluorescent glow considering intense radiation through the celebrity
  • adjective:
    • a nebula exhibiting a uniform disk, like that of a planet.

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