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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

    once in a blue moon
    very rarely
    I only go to that restaurant once in a blue moon.



    1.
    Choose an idiom to replace the expression in the brackets:
    The furniture arrived (without damage) after moving across the country.

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