.66 < a/m < .87

The fastest a black hole can spin is a/m = 1 (a/m is a dimensionless spin speed, obtained by setting the gravitational constant G, and the speed of light c, to 1). This may not mean anything to you, but I studied this in my thesis. Current observations of a 6.1 billion year quasar. That’s fast for a black hole.

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