PASADENA, Calif., Dec. 3 (UPI) -- U.S. astronomers report they've spotted two supermassive black holes at the heart of a remote galaxy, apparently circling each other in a death spiral.
The sighting of what is being termed a rare phenomenon was made with the help of NASA's Wide-field Infrared Survey Explorer, the agency's Jet Propulsion Laboratory in Pasadena, Calif., reported Tuesday.