there is no certain rigid factor, to state about this topic. everything is arguable, one way or another. I knew someone would certainly raise the question, who created the creator? Creator, in my sense is time. Time was the creator, and who created time?? time created itself.. there is no explanation. but again, it can also be expalined the other way around, we can state there was no creator, everything happened fundamentally, step by step, we question about creator because human mind is in need for cause in every sense..for example, when you see a beautiful picture will you not suspect a good artist might have drew that picture, just like that when we talk about the universe we begin to state it had a creator, but did it or did it not, we dont know. space is for now infinite, because we have not yet known the finite porpotion of space, nor we can ever know, atleast in our lifetime. We need to compare something to something else for its end, so even if there is an end, everything that comes after that is still universe, because universe is everything that is their. we cannot have its end. Finally, these are the same words said by Nepaliballer and Yatri earlier.