2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34872Attention is drawn to the fact that the well-known expression for the red-shift of spectral lines due to a gravitational field may be derived with no recourse to the theory of general relativity. This raises grave doubts over the inclusion of the measurement of this gravitational red-shift in the list of crucial tests of the theory of general relativity.3 pagesGeneral Relativity and Quantum Cosmologytext