Light does not always travel at the speed of light. The velocity of light can change, based on the type of materials through which it is passing. Light will travel at the constant rate known as the speed of light if it is traveling in a vacuum or in a situation in which there are no impediments to slow the progress of that light. The slowest traveling light achieved in a controlled laboratory setting was at 38 miles per hour (61 km/h), or 17,647,768 times slower than the speed of light. This phenomenon was created by directing a laser beam into cold sodium atoms, triggering a significant reduction in light velocity.
More facts about light travel:
I used to think nothing travels faster than the speed of light, school crap? Not so if you think further. The universe is moving through space; our solar system is spinning, our planet is spinning and revolving and everything is moving away from something to something? I now believe that God puts what we need to see as we look further into infinity. Where does space end? God said I will confuse the wise not enlighten.
It's almost all theories unproven and guesses. Who cares?