There isn’t another side to a black hole (as far as we know), at the very heart of one is a huge singularity which has such a high gravitational pull that to escape the gravity you have to break the speed of light, as light can’t go faster than it’s speed limit, it doesn’t escape and so all we can see is a really black patch of the sky!
Well as James said, we just don’t know. This is one of the things can have lots of hypothesis about but that we may not be able to 100% prove because we cant rally go into the black hole to make sure we are right.
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