2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/15387Significant advances in science inevitably occur when the state of the art in instrumentation improves. NASA's newest Great Observatory, the Chandra X-Ray Observatory (CXO) -- formally known as the Advanced X-Ray Astrophysics Facility (AXAF) -- launched on July 23, 1999 and represents such an advance. The CXO is designed to study the x-ray emission from all categories of astronomical objects from normal stars to quasars.9 pages, 13 figures For the proceedings of the NATO-ASI held in Crete, Greece, 7-18 June,1999Astrophysicstext