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.
Isn’t most everything spinning? Seems like having zero angular momentum would be rare and remarkable. I’m not even sure how exactly to define zero momentum in terms of reference frames.
If you're asking that then you first need to ask what the distinction between the two is. and further does it even make sense for one to spin and not the other
I thought we already knew they spun, given the incredible amount of angular momentum in their accretion disks. Seems like a "duh" thing to prove with image data that the physics data already implied.
I thought so as well but the article says the spin doesn't match the accretion disc, I'm not sure if that's s significant aspect of the discovery possibly? I'm not well versed in relativity to be honest
Edit: forgive me, someone below said pretty much this
I mean the majority of black holes spin... It's kinda fundamental to their existance as most things in the universe have motion and when you super compress those things into a black hole, that motion has to go somewhere.
Not really. But it's always good to get confirmation of our theories. And it's usually even more exiting to find an error in a well established theory.
And then you've got to consider that at least mathematically a black hole doesn't have any volume, so what could actually spin in something that's infinitely small? This more or less confirms that this is bullshit.