2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/10646Accretion onto old, isolated neutron stars is reviewed. The detection of their X--ray emission with ROSAT is discussed and a summary of the current status of observations is presented.5 pages, uses scprol.sty (included). Talk presented at the 2nd Sakharov Conference on Physics, Moscow May 20-25, 1996. To appear in the ProceedingsAstrophysicstext