Abstract
Based on established representations, reliable facts and phenomena, the proposed model of the interaction of electromagnetic waves with a physical vacuum is studied. It is shown that from the assumption of a physical vacuum as a dielectric medium, the postulate of the constancy of speed of light follows in all inertial reference systems. The explanation of the partial capture of light by a moving medium (the effect of Fizeau), the effect of a gravitational lens, displacement of the spectrum of an electromagnetic wave in a gravitational field is given. The redshift of the spectrum of galaxies may have an alternative explanation not related to their expansion. As a result of this explanation there is no need to use the idea of dark energy.
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