If the universe ever expanded again at a volicity exceeding the speed of light, what would happen?
Firstly, ignore most of the answers you have already received, I have read them and they show a severe lack of understanding. The speed of light limit only applies when you are in an “inertial frame” — that is, sitting where you are, without any forces acting on you, and measuring the speed of an object that moves past a ruler and clock that you are holding in your hand. Across the large distances in the universe, however, we have a very different set of circumstances. No one is in an inertial frame, because everyone is being accelerated with respect to everyone else, due to the universe’s gravitational field and the fact that the universe is expanding. In effect, the universe’s expansion isn’t really due to galaxies moving “through space” away from each other, but rather due to the stretching of space itself, which isn’t governed by the same limits that we are. no object with any finite rest mass can move at the speed of light. That is why all the particles that move at the speed of