system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What scientific logic supports the infinite universe theory? How can this be possible or even perceivable?
gpt
Just from a logical point of view, if the universe is finite, what happens when you get to the edge? Is there anything outside it? If yes, then isn't that part of the universe? If no, is the edge some sort of barrier? What would it be made out of? Or does existence just stop once you pass the edge? 

An infinite universe seems like a simpler answer, and science favors simpler answers.