| NOUN | quantity | Hubble parameter, Hubble's constant, Hubble constant, Hubble's parameter | (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observer |
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| Meaning | (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. | |
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| Synonyms | Hubble's constant, Hubble constant, Hubble's parameter | |
| Category | cosmology, cosmogony, cosmogeny | The branch of astrophysics that studies the origin and evolution and structure of the universe |
| Broader | constant | A number representing a quantity assumed to have a fixed value in a specified mathematical context |
| Catalan | constant de Hubble | |
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