2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/3505I discuss several general-relativistic effects that are likely to be of interest in the astrophysics of black holes and neutron stars6 pages, 1 figure, SF2A (eds), 2001-Lyon, May 28-June 1st, EDPS Conference Series in Astronomy & Astrophysics, in pressAstrophysicsPhysics near a black-hole horizontext