If you're having a hard time visualizing the Big Bang, let Columbia University astronomy and physics professor Janna Levin show you how it all started. In this first-rate animation that shows the Big Bang more concisely than I've ever seen, the professor makes an important point about the origin of our doughnut-shaped universe: Before the Big Bang, there was no space or time. There was nothing. That huge explosion didn't happen in space — it happened in the middle of nothing.
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