Among the ideas facing revision is Einstein's belief that the speed of light must always be the same - 186,000 miles a second in a vacuum. There is growing evidence that light moved much faster during the early stages of our universe.
This doesn't bother me. In the very early universe, light could have moved faster. That's virtually implied by cosmological inflation. As long as no causality violations are involved, I see no problems. Now, of course, there are definite problems if we start traveling or communicating faster than light. But initially, photons moving out to the horizon faster than c, that's no big deal, theoretically. Or am I missing something?