H<sub>0</sub>, Hubble Constant

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Astrophysics

A measure of the expansion rate and age of the universe. It appears to be between 60 and 80 kilometers per second per megaparsec. (A megaparsec is equal to 3.26 x 10⁶ light-years.)

Lawrence Berkeley National Laboratory's Physics Division — The Universe Adventure Glossary retrieved 2014-05-20