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Is it theoretically possible to shoot something through the ring? Or does the even horizon completely envelop it?
the event horizon is effectively a sphere, like inflating a donut-shaped balloon (that can't pop). Eventually the middle hole is going to close like a sphincter (enjoy that imagery) and the whole thing will approach the shape of a sphere because that's what anything becomes when you inflate it hugely.
It is, and you won't believe what happens!
...
What? What do I look like, PBS Spacetime??
userface checks out
https://www.pbs.org/video/how-black-holes-spin-space-time-klqijt/ talks about passing through the ring
Gracias, amigo