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English noun: Hubble's constant

1. Hubble's constant (quantity) (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

SynonymsHubble constant, Hubble parameter, Hubble's parameter

Broader (hypernym)constant

Domain categorycosmogeny, cosmogony, cosmology

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