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  1. Dictionary
    Hubble's constant
    /ˈhʌb(ə)lz/

    noun

    • 1. the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer. The reciprocal of the constant is called Hubble time and represents the length of time for which the universe has been expanding, and hence the age of the universe.

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