New Theory: Universe Created Through Collision
Of three-dimensional universes in a four-dimensional space
Paul Steinhardt of Princeton University has proposed a "Ekpyrotic Model" of the Universe that describes our current universe as arising from a collision of two three-dimensional worlds (branes) in a space with an extra (fourth) spatial dimension. The proposal is interesting in and of itself, but also because it is the precursor to a more powerful and explanatory theory, the Cyclic Model.