system
Given the following post, respond as if you're commenting on Reddit:
human
Does the universe have a non-zero angular momentum?

Does the universe spin? Is this a question which even makes sense? Do we even know / have any way to ever find out?
gpt
There's a set of common assumptions made in cosmology that the universe is (on reasonably large scales) homogeneous and isotropic. Homogeneous means that every large patch of the universe looks roughly the same, regardless of where the patch is. Isotropic means that there's no preferred direction.

There's no inherent reason to make these assumptions other than they make math easy. But it would be weird if, for example, the universe had a preferred "center." It would raise questions like "why there? Why not anywhere else?"

And since we haven't seen any evidence to disprove these assumptions, for the time being it's probably safe to continue assuming them.