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Expanding Universe. The distant galaxies we see in all directions are moving away from the Earth, as evidenced by their red shifts.Hubble's law describes this expansion  means expansion in the universe wchic is occoured by the big bang Hubble's initial value for the expansion rate, now called the Hubble Constant, was approximately 500 km/s/Mpc or about 160 km/sec per million-light-years. a
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How was Hubble's constant calculated. And what do you mean by red shifts?