Johann Georg Hagen

Johann Georg Hagen (born March 6, 1847, Bregenz, Austria—died Sept. 5, 1930, Rome, Italy) was a Jesuit priest and astronomer who is noted for his discovery and study of dark clouds of tenuous, interstellar matter sometimes known as Hagen’s clouds. Hagen served as director of the Georgetown College Observatory, Washington, D.C., from 1888 to 1906, when Pope Pius X appointed him director of the Vatican Observatory. In 1893, while compiling a general catalog of bright...