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    hubble's constant

    hubble's constant - 365bet中国官方网站 definition and meaning for word hubble's constant

    Definition
    (noun) (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer; the Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today

  • Word used in video below:
    text: constant care they need just the right
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