From what I've heard, the university consists of nothing, except for the planets, stars, and the stars "output". (And of course also some other smaller objects). If universe consists of nothing, how would it then expand. How would nothing, expand into nothing? If the outside of the universe is "nothing" then it would be a part of the universe already. Otherwise, if we say the "outside" actually existed of something, then the energy of the outside would be added to our universe, e.g. energy would be created. So simply, how can nothing expand into nothing?