2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/3549We introduce the concept of "quasi-universe" and describe the Einstein-Rosen bridge as an extreme wormhole connecting two quasi-universes.9 pages, LateX2e, 2 figures, to appear in the Proceedings of "Frontiers of Fundamental Physics 4", December 9-13 2000, Hyderabad, IndiaAstrophysicstext