Clocking the Extreme Spin of a Monster Black Hole

Astronomers have observed a supermassive black hole in a distant quasar and made a stunning discovery -- it's spinning one-third the speed of light.

Published On 03/15/2016
10:50 PM EDT
An illustration of the binary black hole system in OJ287. The predictions of the model are verified by observations. | Gary Poyner, UK