Not to digress from the original question but I’ve always been interested by the idea of what the overall “shape” and “barrier” of the universe might actually be, after reading Cosmos by Carl Sagan he shed some light on that question, which at the time of publication there was some speculation that the universe is actually a 4 Dimension hypersphere, which could also be called a glome

An article I had found which I’ll try to find later on my desktop bookmarks insinuated one of the implications of this is that if you attempted to travel in a straight line, away from your point of origin, you would eventually wind up back where you started (I probably butchered that idea, but I hope it’s at least partially right in a broad sense)

I just bring that up since it’d be hard to define what two “ends” of the universe are