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
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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
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