Imagine we had somehow filmed the whole history of the universe and you could play the movie in reverse. It would start off much as things stand today: a vast and elegant web of galaxies and nebulae.
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What came before the big bang?
You Don’t Actually Understand the Big Bang (And That’s Okay) For decades, the Big Bang has been taught as the moment when the universe suddenly appeared from a single point and exploded into existence ...
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