2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/206897The effect of the large-scale cosmological expansion on small systems is studied in the light of modern cosmological models of large-scale structure. We identify certain assumptions of earlier works which render them unrealistic regarding these cosmological models. The question is reanalyzed by dropping these assumptions to conclude that a given small system can experience either an expansion or a contraction of cosmological origin.7 pages. Accepted for publication in Europhysics LettersAstrophysicsGeneral Relativity and Quantum Cosmologytext