Hubble constant

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.

1950–55; after E. P. Hubble Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
Hubble constant
Also called: Hubble parameter 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

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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