[Erax]

Narf : boxes... back pain... are you working as a mover ?
The universe : There might have been another universe before the Big Bang, which collapsed in on itself. And another one before that, and so on. When ours begins to contract, time will not run backwards. It has been established with reasonable certainty that our universe is finite and has the shape of a 5D sphere (considering time as the 4th dimension). No one knows what is 'outside' our universe because we cannot perceive this theoretical 5th dimension, but whatever it is out there, it probably doesn't follow the physical laws of our universe.