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After astronomers decided that the universe might be expanding they introduced the '''Hubble constant''' as the measure of speed of this hypotetical expansion as a ratio of assumed recession velocity of galaxies to their distance. The '''Hubble constant''' equals approximately
After astronomers decided that the universe might be expanding they introduced the '''Hubble constant''' as the measure of speed of this hypotetical expansion as a ratio of assumed recession velocity of galaxies to their distance. The '''Hubble constant''' equals approximately, for <math>v<<c</math>
:<math>H_o=v/c/r</math>,
:<math>H_o=v/c/r</math>,