Hubble constant

/ˌhʌbəl ˌkɑnstənt/
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Definitions of Hubble constant
  1. 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
    synonyms: Hubble parameter, Hubble's constant, Hubble's parameter
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    type of:
    constant
    a number representing a quantity assumed to have a fixed value in a specified mathematical context
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