Belgian astrophysicist. Full name: Paul Joseph Ledoux. Major affiliations include: Belgian Govt. fellow, Institute for Theoretical Astrophysics, Oslo, Norway, also Stockhlm (Sweden) Observatory, 1939-1940; Belgian American Foundation fellow, Yerkes Observatory, Williams Bay, Wis., 1940-1941, 1946-1947; with University of Liege, 1947-.