I don’t think that Big Bang theory says there was nothing before it. It imply that because everything that is the universe we know come to existence with Big Bang we can not know what, if anything existed before Big Bang.
I do have problem to believe that space expanded and that it keeps expanding. That seems to imply to me that space itself is just another transformation of mater or energy.
Black holes, well if neutron stars exist I can not see reason that if very massive star collapses why it could not compress its core to form black hole
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