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planetary nebula

n.
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

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Word of the Day

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    Idiom of the Day

    good riddance to bad rubbish
    used to show that you are happy that someone or something has been taken or sent away
    "Good riddance to bad rubbish! I don't like him and I am glad that he is gone."



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