2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/88013A new interpretation of cosmological redshifts is proposed to construct the evolved-vacuum model of this phenomenon.The physical vacuum was considered to be a real matter with time-dependent permittivity and permeability. Time variation of these parameters 10^{-10} per year was shown on the base of Maxwell's equations and Hubble's law to obey the exponential behavior causing step-by-step decrease of light velocity with a rate of about 3m/s over 100 years. Cosmological aspects are discussed to explain some features of reality of the Universe evolution.14 pages,one table,14 references,appendixClassical PhysicsOpticstext