Cool to see someone articulate this specific point. My dad has some grad schooling in astrophysics so we used to chat about this kind of stuff when I was young

Cool to see someone articulate this specific point. My dad has some grad schooling in astrophysics so we used to chat about this kind of stuff when I was young (still now but less so). I’d always ask “if the universe is expanding what is it expanding _in to_” and he’d kind of always change the subject to black holes or something. Thinking back on that it’s amazing how easy it is to “question” or “push/poke” the boundaries of known (or even knowable) knowledge. But alas guess it just furthers the point of how all people ponder these things.