Labels:text | font | paper | letter | document OCR: COMPTON GAMMA-RAY OBSERVATORY (GRO)1 LAUNCH DATE 1991 MISSION DETAILS Observed gamma rays from quasars, the Milky Way Galaxy, and solar flares. It has provided data on supernovas, young star clusters, pulsars, and possible black holes. ROSAT (ROENTGEN SATELLITE) LAUNCH DATE 1990 MISSION DETAILS Collecting X-rays, it studied radiation from very hot white-dwarf stars and active galaxies. It found a star in this galaxy that was estimated to have a temperature of 170,000 ℃ (306,000 ºF), the hottest star so far discovered. IRAS (INFRARED ASTRONOMICAL SATELLITE) LAUNCH DATE 1983 MISSION DETAILS Surveyed the whole sky for infrared sources, discovering 200,000 objects. It discovered seven comets, surveyed asteroids, and mapped dust clouds in the Milky Way Galaxy. IUE (INTERNATIONAL ULTRAVIOLET EXP ...
