Space itself can travel at faster than light speed. This is the basis of the warp drive.
Space is the absence of matter. It is non-material.
Non-material things can exceed the speed of light because they have no mass. E=MCsquared where M=0 , means the E( Energy required to get to speed of light or faster) =0.
Assuming that is true, then we will never, ever find out how big the allegedly expanding universe is because it is expanding faster than the speed of light.
Unless it's infinite and then one must ponder, where is space going to ?