hubble constant

Noun
  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;
    The Hubble constant is not actually a constant, but is regarded as measuring the expansion rate today (synset 113611801)
    referred to in: cosmogeny, cosmogony, cosmology - the branch of astrophysics that studies the origin and evolution and structure of the universe
    is a type of: constant - a number representing a quantity assumed to have a fixed value in a specified mathematical context
    same as: hubble parameter, hubble's constant, hubble's parameter

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