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Get astronomy tweets here: http://twitter.com/DeepAstronomy The question of what caused the Big Bang is one of the most difficult facing humanity. We may never find an answer, and even if we do, we probably won't understand it. It's difficult to imagine an event occurring without a cause, and yet, that is precisely the prospect we are faced with when it comes to this question. Music used: http://www.archive.org/details/AristotleSplitFiles http://www.archive.org/details/String_Theory_Album http://www.archive.org/details/Chosen