you know, that subject has always raised my curiosity, i was told by a teacher long ago that if a person sat down and thought about where the universe ends it would drive a person crazy from the thought process, personally i don't think it does end, its infinite we only know what our probes have found with the data sent back, and i don't know if we even have the engine technology that would push a probe into infinity, the interesting thing is how many years would this take to find the end of the universe, I'm not that scientific of a person, but i just can't believe we are the only ones that occupy this universe, how ever small or Infinite it may be, i don't think we will ever know in our lifetime