Hubble-constant meaning

(proper) A ratio expressing the rate at which the universe is expanding, the so-called constant in Hubble's law, equal to the velocity of a receding galaxy divided by its distance from the earth: symbol, H0
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(astronomy) A number that expresses the rate of expansion of the universe; the velocity at which a distant object is receding from the Earth divided by its distance; its reciprocal gives the age of the universe.
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Origin of hubble-constant

  • After Edwin Powell Hubble, American astronomer

    From Wiktionary