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The most significant problem with Big Bang Cosmology is that it has its limits. It makes no attempt to explain what occurred prior to the start of expansion, or what drove the expansion to start -- and has never claimed to do so. That our Universe has, over the last 13 billion years or so, has been expanding at a (fairly) constant rate, and that it was once almost infinitely more dense that it is today, is as incontrovertible a fact as interplanetary gravity. But the state of our Universe prior to that is, like the question of why we have lightning in the sky, presently unknown.

Big Bang Cosmology (presently) also fails to explain why our Universe is so overwhelmingly matter, with almost no anti-matter in it.

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