Abstract
Using the law of conservation of energy-momentum and the postulate of the constancy of the speed of light, the dependences for the length of the electromagnetic wave with red and blue shift when the Doppler effect are derived. Moreover, using this approach, general formulas for the gravitational shift (red and blue) are derived, and the Compton effect is explained from these positions. It is also shown that for any redshift, galaxies will always have a speed lower than the speed of light in a vacuum. Taking the speed of light in vacuum, as the escape velocity for the visible part of the Universe, the mass of the Universe is calculated.
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