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hubble's constant

n.
1.(cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer

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    Idiom of the Day

    rob the cradle
    to marry a person much younger than oneself
    Everybody said that my boss was robbing the cradle when he married the young woman at our company.



    1.
    The fast wind was ________ the window-pane and that sound was driving her crazy.

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