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That makes sense, but while I suppose we don’t have proof of space being infinite, is it not pretty intuitively certain that’s the case? Otherwise that would imply there’s some sort of border, which I guess is possible, but doesn’t make a lot of sense.
No, finite doesn't necessarily mean it has a border. The surface of the earth has finite area, but one can theoretically travel along the surface of the earth forver in any one direction without ever hitting any border. (You'd of course eventually return to where you started, but not hit a border.) The universe may well be the same way. A "hypersphere" if you will. That is, maybe theoretically if you traveled in "a straight line" forever, you'd eventually find yourself where you started rather than ever hitting an edge or boundary or border.
Ah, makes sense