2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/3656Using cosmological relativity theory, we derive the formula for the cosmological redshift written explicitly in terms of 1 - "Omega", where "Omega" = "rho"/"rho"_c is the ratio of the average mass density to the critical "closure" density. Based on the present-day data of observed redshifts, we conclude that "Omega" is less than one.4 pages LaTeX. To appear in Internat. J. Theor.PhysAstrophysicstext