Your question reads like you think there's an expansion from something to somewhere else. Like, as though people were periodically allowed to run in opposite di

Your question reads like you think there's an expansion from something to somewhere else. Like, as though people were periodically allowed to run in opposite directions from a 50 yard line, and we're observing them from the 35 yard line as we slowly run in one direction or the other. But that's not what's going on, given the near-uniformity of cosmic microwave background radiation.