How can everything be expanding, but not from a central point?
It’s not too hard to understand how there’s no central point in the case of an infinite universe: in the raisin cake analogy, as the cake expands, no matter what raisin you are, you’ll be moving away from all the other raisins. If the cake is infinite, then there’s no special, central raisin. However, even if our universe is finite, you can still have an expansion with no central point in your universe. The cake analogy breaks down here because a finite cake has edges, but a balloon analogy can help: imagine that your universe is the 2-dimensional surface of an expanding balloon. Imagine you are an ant living on the surface of the balloon: for you, the entire universe is the surface of the balloon, and 3-dimensional space outside does not exist. As the balloon blows up, your fellow ants appear to be moving away from you. Every one of your fellow ants also sees you moving away. There is no special, central ant in your universe. The surface of the balloon does not have an edge, nor is th
