... seemed amiss, so with the aid of two instruments on ground-based telescopes, iSHELL on the NASA Infrared Telescope Facility and the Near Infrared Spectrograph on the Keck 2 telescope, a team of US scientists now have evidence that paints a very...
... be circling a black hole. After the initial discovery, the world's largest optical telescopes - Spain's 10.4-m Gran Telescopio Canarias and the 10-m Keck I telescope in the United States - were used to determine the system's physical parameters. The...