When something travels at the speed of light it really doesn’t experience any time.
It seems that if you are a qualified physicist you can say this. You can say the opposite, and you can also say that neither is true.
Ah; the freedom conferred by a PhD!
Of course, I will not suggest any sort of thought experiment that might throw any light on this, because someone (possibly Pete?) would justifiably point out that nothing with mass can be accelerated to “c”, so any thought experiment involving such heresy would be based on something that broke one of the cardinal laws of physics, and was therefore invalid.
Isn’t it a shame that Einstein is not still with us. He accelerated himself to “c”, in a thought experiment, and survived. (Did he have a PhD at the time?) It might be argued that he was justified, because that cosmic speed limit had not been established then. In fact this thought experiment was largely responsible for the establishment of that law.
I suppose that only a philistine would mention that this means that one of the bastions of modern physics is based on an invalid thought experiment. What a good thing there are no philistines in this thread.
