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Pre-Bang branes and bubbles

What happened before the big bang?

By
12:09pm, April 8, 2011

Cosmologists Paul Steinhardt and Neil Turok liken the early history of the universe to a play in which the protagonists — matter and radiation — move across the stage according to the laws of physics. Astronomers are actors who arrived on the scene 13.7 billion years too late to know what happened.

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