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Hubble's constant

noun, Astronomy.
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for hubble constant

Hubble constant

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 & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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