I'm not a Scientist, Engineer, or Physicist. I am very intrigued by this subject however. I always wondered what could be if space ends. I have come to a conclusion which may relate to this topic. Again I didn't arrive at this hypothesis by mathematical computation. So here is my hypothesis. If our universe ends that means whatever is outside the universe is void of all matter and energy. It's a dark, silent, formless infinity. However if we were to travel there and enter that space we would, in theory, expand our universe as we are made of matter and, therefore, the laws of physics would suddenly apply to that space that was previously devoid of any physical law. In the act of observing, we are involved in that space which alters that environment in much the same way we would alter space outside our universe by entering it.