Yeesh hard question! Some people think the universe isn’t infinite, but that once you exit one side, you come back out the other. Seems hard to imagine, but it’s kind of like walking from one side of the world to the other. On the map, it looks like you would fall off the edge to nowhere, but you just reappear on the other side of course!
Additionally, it depends on what you determine as the universe. If you mean ‘the space which all matter currently occupies’ then I would say it probably is finite. If you mean ‘the space which can explore and travel to’ I would say it’s probably infinite, but I have a small brain when it comes to big physics questions so who knows!
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