"Started" by lack of agreement between black holes and quantum theory, and also by some experiment.
Explains dark matter and dark energy.
Very interesting stuff (well, for me...)
BTW, I seem to remember I've heard similar hypothesis long time ago, about exotic kind of stars (in place of black holes) composed of "shell", and that the Universe can be the insides of such star. Didn't seem so "documented" back then (perhaps it was different thing)
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