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
Can’t wait for Anton on YouTube (Link ) to upload somethin about this.
Man explains things so nicely and so well. Always somethin interesting and it’s less time spent doom scrolling or listening to people yell at each other in comments
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
Even if there is heterogeneity inside the system, that does not indicate severability or that the whole system is made up of smaller constituent systems.
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.
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.
I thought nothing actually crossed the event horizon and was essentially frozen approaching a complete stop in time in a kind of 2f representation of 3d reality until it slowly leaked out trillions of years later as hawking radiation?
From an outsider’s perspective, you would see an object approach and then freeze. It would red-shift dimmer until it disappeared. From an in-falling perspective, I don’t think you’d notice anything at all.
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.
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 whole 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.
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.
Nationalise utilities. But the GOP would just attack them when they are in power. Fucken hate the clown show. Maintenance is bad all over this fucking country cause everyone gets so butthurt they can’t pinch those pennies into their own accounts. Its fucken maddening I hope the whole bitch falls apart just so I can rub the ashes in their faces.
I’m at this point pretty convinced that the US is like your friend in high school that never changed the oil in his car because it still started and ran, until of course it didn’t.
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