Thanks for this explanation!
Physics is amazing stuff.
The concept that photons experience no time at all is mind boggling.
That implies that to a photon traveling from Deneb (a star 2600 light years away) to Earth, it would appear it arrived on Earth instantly after being emitted by Deneb!?
RE: ASK ME PHYSICS: I know time slows down when you move faster (barely noticeable unless you approach the speed of light). But why?