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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

    (one's) hair stands on end
    to be frightened or afraid of something
    My hair stood on end when I saw the scene of the automobile accident.



    1.
    In a way it's probably just as well the deputy has become the new chief. It's a case of ________ the devil you know.

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    French astronomer Adrien Auzout had once considered building a telescope that was 1,000 feet long in the 1600s. He thought the magnification would be so great, he would see animals on the moon      .. More >>
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