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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, for <math>v<<c</math>
After astronomers realised that the universe is expanding they introduced the '''Hubble constant''' as the measure of speed of this 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>,