How can the fabric of spacetime expand at a certain acceleration? Isn't speed the rate of space divided by time itself? How can you measure spacetime only using variables that are dependant on spacetime? It's like trying to measure the length of a stick using a stick."Kind of like saying an eye to see. The eye can't see unless it has a pair of eyes to see itself because it's an observer obtaining and using the eye that is doing the seeing, not the eye itself." But what really is expanding? The space in and between objects or everything in reality itself? And expanding relative to what?