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hubble 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

    run out of (something)
    to use all of something
    The car ran out of gas in the countryside.



    1.
    Fortunately, the rain held ________ for a few hours so we were able to have the party in the garden.

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