Or is it gateway to another area in our own universe?
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possibly. We cannot know the answer to this question. If there were such "things" and we could manage those things to our advantage, then it would be great and we could finally see the truth. I looked up Kerr black holes and its just a black hole with angular momentum. Its spinning? I thought all black holes did that. But im no scientist.
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there is no way to ever know, seeing as anything that passed into the black hole would be destroyed beyond any reconigition we would never be able to get any information back from it.