Groundbreaking Measurement Shows a Black Hole Spinning at a Quarter the Speed of Light gizmodo.com.au - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from gizmodo.com.au Daily Mail and Mail on Sunday newspapers.
The fortuitous encounter of a distant supermassive black hole with a star, which it rapidly annihilated, allowed astronomers to measure the speed of the black hole s spin.Every black hole has spin,.