Definitions for "Hubble Constant"
A measure of the rate at which the Universe is expanding. The Hubble Constant relates the apparent recession velocity of a galaxy to its distance from the Milky Way. The precise value of the Hubble Constant is unknown, although independent measurements have established the value of this constant to be between 50 and 80 kilometres per second per mega parsec (in other words, for every megaparsec, the object's velocity of recession increases by 50 to 80 km/s).
The numerical factor, usually denoted H, that describes the rate of expansion of the universe. It is the proportionality constant in the Hubble law v ~Hd, which relates the speed of recession of a galaxy to its distance . The present value of H has recently become fairly well known; estimates range between 47 and 63 km/sec Y Mpc, giving an age of the universe around 14 billion years. A to F | G to L | M to R | S to Z
Constant of proportionality (H) that appears in the Hubble law of recession of for galaxies. Its presently determined value is about 17km/s/megalight year.