2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/226768The periodical component predicted by the theory of optic-metrical parametric resonance was recently found in the signal of Sep A radio source. If such observations performed independently give similar results, they would provide another evidence of the gravitational waves (GW) existence and the perspectives of the GW astronomy could be discussed.8 figuresAstrophysics of Galaxiestext