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Hubble constant definition

☆ Hubble constant

a ratio expressing the rate at which the universe is expanding, the so-called constant in Hubble's law, equal to the velocity of a receding galaxy divided by its distance from the earth: symbol, H

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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