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Tyson asked Hawking your standard softball interview question: what was around before the big bang? In other words, what happened before the moment the universe began?
“The boundary condition of the universe...is that it has no boundary,” Hawking says.
Basically, Hawking’s favorite answer to this question is that there kind of isn't any such thing as a time before the big bang. Time smooths out as you get closer and closer to the big bang, such that it never actually narrows down into a starting point. In the words of another famous master of time and space, it's just a big ball of wibbly-wobbly, timey-wimey... stuff.