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08/21/2005 Entry: "Ekpyrotic Universe - Fact or Fiction"

Paul J. Steinhardt of Princeton University explains that "The Ekpyrotic Model of the Universe proposes that our current universe arose from a collision of two three-dimensional worlds (branes) in a space with an extra (fourth) spatial dimension." ... does this make sense? Here's a pretty hard/strong/tough challenge question ... Just how did the Universe begin?