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Hubble's constant
Hub·ble's constant H0311300 (hŭb′əlz)n. A ratio used in Hubble's law to express 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, approximately 71 kilometers per second per megaparsec.
[After Edwin Powell Hubble.]Hubble's ConstantIn 1924, Edwin P. Hubble discovered that the farther away a galaxy is, the faster its apparent speed. The speed-to-distance ratio is the constant, now measured at 30–60 mi/sec (50–100 km/sec) per million parsecs.Thesaurus| 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 todayHubble constant, Hubble parameter, Hubble's parametercosmogeny, cosmogony, cosmology - the branch of astrophysics that studies the origin and evolution and structure of the universeconstant - a number representing a quantity assumed to have a fixed value in a specified mathematical context; "the velocity of light is a constant" |
EncyclopediaSeeHubble's lawHubble's constant
Related to Hubble's constant: Hubble diagram, Hubble timeSynonyms for Hubble's constantnoun (cosmology) the ratio of the speed of recession of a galaxy (due to the expansion of the universe) to its distance from the observerSynonyms- Hubble constant
- Hubble parameter
- Hubble's parameter
Related Words- cosmogeny
- cosmogony
- cosmology
- constant
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