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Conventional wisdom says that the Big Bang was the start of everything, including time, so questions about the Big Bang itself, or what came before, don't make sense. Or so we're told. But the breakdown in the laws of physics — the singularity problem — limits what we know about the starting conditions of the Universe. In the loop quantum universe everything is quantized, or discrete, including time. Freed from the singularity, Bojowald can now look back to a time 'before' the Big Bang. He finds an inverted universe on the other side — a mirror-image of ours — expanding outwards as time runs backwards.
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