Got it. That makes sense with an infinite universe*. I was assuming a universe of finite size that has been growing rather than merely stretching out. As for why I assume that, I admit that a universe of finite size feels more comfortable to me from a metaphysical / spiritual / whatever you want to call it standpoint than a universe of infinite size.
ETA. I misspoke. It doesn’t make sense to me. Which is a big part of why I prefer the idea of a universe that is really big but of finite size. But that’s a matter for a different thread.