Hawking only recently gave his own take in an interview with Neil deGrasse Tyson, where he likened the space-time dimensions of the Big Bang to the South Pole. "There is nothing south of the South Pole, so there was nothing around before the Big Bang," he said.
But other physicists have argued there's something beyond the Big Bang. Some propose that there is a mirror Universe on the other side, where time moves backwards. Others argue in favour of a rebounding Universe.
Taking a slightly different approach, physicists Tim A. Koslowski, Flavio Mercati, and David Sloan have come up with a new model, pointing out that the breakdown arises from a contradiction in properties at a particular point in time as defined by general relativity.
What the theorem doesn't imply is how the Universe as we observe it necessarily gets to that point in the first place.
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