Hi, We all know the universe is expanding and it's doing so at a rate greater than the speed of light. But what does expansion mean? Popular Science videos usually give the loaf of bread example expanding in the oven. But even the loaf of bread has limits, it can only expand so far. Do we know or speculate if the spacetime fabric can expand forever? We already know it can curve with no limits (well, except in black holes, that's when our understanding of everything goes down the toilet). The fact is, we don't know what spacetime fabric is made of, so how can we possibly know its limits of "elasticity"? At least, I don't :) Great to know your thoughts. Bye!