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Did Time Run in Reverse Before the Big Bang?

Like a mountain looming over a calm lake, it seems the universe may once have had a perfect mirror image. That’s the conclusion a team of Canadian scientists reached after extrapolating the laws of the universe both before and after the Big Bang.

Physicists have a pretty good idea of the structure of the universe just a couple of seconds after the Big Bang, moving forward to today. In many ways, fundamental physics then worked as it does today. But experts have argued for decades about what happened in that first moment — when the tiny, infinitely dense speck of matter first expanded outward — often presuming that basic physics were somehow altered.

Researchers Latham Boyle, Kieran Finn and Neil Turok at the Perimeter Institute for Theoretical Physics in Waterloo, Ontario, have turned this idea on its head by assuming the universe has always been fundamentally symmetrical and simple, then mathematically extrapolating into that first moment after the Big Bang.

Eric Vance, Live Science

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