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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. Approximately the '''Hubble constant''' equals
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
:<math>H_o=v/c/r</math>,
:<math>H_o=v/c/r</math>,
where <math>v</math> is assumed speed of recession of a galaxy, <math>c</math>, speed of light in vacuum, and <math>r</math> is distance to the galaxy. This recessional velocity turned out not to be proportional to the distance though and so the '''Hubble constant''' is refered to the the nearest galaxies for which it may be considered to be relatively constant.
where <math>v</math> is assumed speed of recession of a galaxy, <math>c</math>, speed of light in vacuum, and <math>r</math> is distance to the galaxy, and its exact value turned out to be
:<math>H_o=c/R_E</math>,
where <math>R_E</math> is [[Einstein's radius of universe]].
The recessional velocity turned out not to be proportional to the distance though and so the '''Hubble constant''' is refered to the the nearest galaxies for which it may be considered to be relatively constant.
The [[Essay:Problems in Cosmology]] explains the possibility of the '''Hubble constant''' being a feature of universe that is stationary (neither expanding nor contracting) and the recessional velocity of galaxies being an illusion caused by the time runing slower at the deep space galaxies than in our Galaxy which mimics the accelerating expansion.
The [[Essay:Problems in Cosmology]] explains the possibility of the '''Hubble constant''' being a feature of universe that is stationary (neither expanding nor contracting) and the recessional velocity of galaxies being an illusion caused by the time runing slower at the deep space galaxies than in our Galaxy which mimics the accelerating expansion.