[JenB]

But is space truly infinite, either? Isn't the universe supposed to start collapsing in on us soon, like the next fifty billion years or so?

From our perspective, is there a actual difference between "really really big" and "infinite", anyway?

[Bear_in_RoseBear]

But is space truly infinite, either?

Well now, that's a good question.

From our perspective, is there a actual difference between "really really big" and "infinite", anyway?

Probably not.