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Oct 29 at 11:32 comment added PM 2Ring Ok, that's better. ;) We usually call that the black hole shadow, and the blackness extends to the photon sphere, as discussed in the answers to physics.stackexchange.com/q/810733/123208
Oct 29 at 11:28 comment added gandalf61 @PM2Ring Ok, to be precise, what you see is the absence of background stars inside the event horizon's disc and the distortion just outside the event horizon's disc caused by gravitational lensing.
Oct 29 at 10:11 comment added PM 2Ring How do you see an event horizon?
Oct 29 at 9:57 history answered gandalf61 CC BY-SA 4.0