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Hubble constant
The present expansion rate of the universe, in units of kilometers per second per megaparsec (km/s/Mpc); it relates the apparent recession velocity of a galaxy to its distance from the Milky Way. The larger the Hubble constant, the younger the universe. Although the precise value of the constant is unknown, independent measurements have established it to be in the range 50 to 80 km/s/Mpc; in other words, for every megaparsec, an object's cosmological velocity of recession increases by 50 to 80 km/s.
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