The most distant black hole whose speed has been measured is rotating at half the speed of light, University of Michigan astronomers have revealed in Nature. It is not yet clear whether this extraordinary speed is an outlier, or indicative of normal black hole behavior six billion years ago.

A year ago the spin of a supermassive black hole was determined for the first time, when the outer layers of the object at the center of Great Barred Spiral Galaxy or NGC 1365 was found to be turning at an astonishing 84% of the speed of light. NGC 1365 is one of the largest known galaxies, more than twice the size of the Milky Way and 56 million light years away.



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