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
British Dictionary definitions for hubble constant
Hubble constant
noun
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