Hub·ble's constant (h b  lz)n. A ratio expressing the rate of apparent expansion of the universe, equal to the velocity at which a typical galaxy is receding from Earth divided by its distance from Earth. [After Edwin Powell Hubble.] |
ThesaurusLegend: Synonyms Related Words Antonyms
| Noun | 1. | Hubble's constant - (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 cosmogeny, cosmogony, cosmology - the branch of astrophysics that studies the origin and evolution and structure of the universe constant - a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant" |
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