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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.

A series of powerful observations has made it clear that our universe has expanded for billions of years, emerging from the hot, dense state we call the Big Bang. Over the past several decades, new ...

In Paul Steinhardt’s corners of the cosmology world, to say that history repeats itself would be a laughable understatement. That’s because according to him and a handful of peers, the universe’s form ...