- the ratio of the recessional velocity of galaxies to their distance from the sun, with current measurements of its value ranging from 50 to 100 km/sec per megaparsec.
Origin of Hubble's constant
First recorded in 1950–55; after E. P. Hubble
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- 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 –1Also called: Hubble parameter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012