Supermassive Black Hole's Dizzying Spin Is Half The Speed Of Light

The spin rate of a supermassive black hole has been measured for the first time, and wow, is it fast. X-ray observations of RX J1131-1231 (RX J1131 for short) show it is whizzing around at almost half the speed of light. Through X-rays, the astronomers were able to peer at the rate of debris fall into […]