# Hubble constant

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## Hubble constant

*n*

(Astronomy) the rate at which the expansion velocity of the universe depends on distance away. It is currently estimated to lie in the range 60–80 km s

^{–1}megaparsec^{–1}. Also called:**Hubble parameter**Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

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Noun | 1. | Hubble 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 todaycosmogeny, 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" |

Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.

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