AMA | October 2024

7163.696 - 7184.133 Sean Carroll

We can say, as far as we know, it's not expanding into anything, but it's conceivable that it is. We have zero reason to think that it is, and we have perfectly good theories that fit the data without it doing that, but maybe it is. And in some sense, there's various theories of extra dimensions in which something like that is actually happening. So I do think that, generally speaking, cosmology...