system
Given the following post, respond as if you're commenting on Reddit:
human
Is the universe infinite?
gpt
We don't know.

And honestly, how could we? The nature of infinity is that no matter how big a number you can write down, infinity is *infinitely* bigger than that. Similarly, we have reasons to believe the Universe is pretty darn big, quite a bit bigger than the parts we can see. But that size still absolutely pales in comparison to infinity. We can't get information from arbitrarily far distances, because the speed of light limit prevents that, so we can never really tell whether the Universe is infinite.

Our best cosmological models do treat the Universe as if it's infinite, although for all practical purposes you could just replace "infinite" with "absurdly big."