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Hubble's law
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Hubble's law

Law that relates a galaxy's distance from us to its speed of recession as the universe expands, formulated in 1929 by US astronomer Edwin Hubble. He found that galaxies are moving apart at speeds that increase in direct proportion to their distance apart. The rate of expansion is known as the Hubble constant. Its currently accepted value is about 70 (km/s)/Mpc (70 km/s per megaparsec, or about 21.5 km/s per million light-years).



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