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    planetary nebula

    planetary nebula - 365bet中国官方网站 definition and meaning for word planetary nebula

    Definition
    (noun) 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

  • Word used in video below:
    text: for the demotion of pluto from planetary
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