The Ekpyrotic scenario provides an alternative to the widely accepted Big Bang theory. It suggests that, unlike the Big Bang that began from singularity, our universe is one of a pair of universe that collided. This means there's another universe out there. That's not too strange considering popular culture accepts the possibility of parallel universes. But if this theory is correct, our twin universe is right next to us in another dimension, separated by a distance less that the diameter of an atom.