Scientists confirm that the first black hole ever imaged is actually spinning::The first black hole humanity has ever imaged has also provided us with what researchers are calling “unequivocal evidence” that black holes spin.
Scientists confirm that the first black hole ever imaged is actually spinning::The first black hole humanity has ever imaged has also provided us with what researchers are calling “unequivocal evidence” that black holes spin.
The black hole and the stuff outside it constitute a single system, and within that system, angular momentum is conserved. So as objects cross the event horizon, their angular momentum is transferred to the black hole.
Removed by mod
For one thing, the size and shape of the event horizon change depending on the black hole’s spin.
What would happen if one were to stop spinning? Could one even stop spinning?
Yes—it’s called the Penrose process.
Removed by mod
That would be a general method, if we were close enough to observe the shape of the event horizon (which we aren’t).
The article is describing another way, which only works in this case because the black hole is precessing so extremely that the changing axis of rotation is frame-dragging the polar jets along with it.