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单词 planetary nebula
释义 Noun: planetary nebula
  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

Derived forms: planetary nebulae

Type of: nebula

Encyclopedia: Planetary nebula

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更新时间:2024/12/21 18:06:19