• synonyms

Hubble's constant

noun Astronomy.
  1. the ratio of the recessional velocity of galaxies to their distance from the sun, with current measurements of its value ranging from 50 to 100 km/sec per megaparsec.
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Origin of Hubble's constant

First recorded in 1950–55; after E. P. Hubble
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018