Is the Universe Finite or Infinite?

Big bang theory doesn't go back that far. Goes back to a very hot, very early, very dense state but not infinitely dense. We don't know what's beyond that. It might be that the universe is infinite and it expanded from something infinite to omething more infinite. But i think you still put t equal zero at the point where the universe would be infinite, kind of, right? The theory just doesn't claim to know what actually happens in that infinity. Strap alat back as far as we can which is up to the plank temperature. And that's what say t equals zero is - our theories are valid until then.