#### bhobba

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You supposedly have a PhD in Chemical Engineering. You should know better. The question is why cant light travel faster than C. C is the invariant speed that comes from the derivation of the Lorentz transformations I gave using group theory. The question is not why light cant travel faster than itself - the question is why cant light travel faster than the invariant speed C, which is by definition the constant velocity the same in all frames that naturally emerges in deriving the Lorentz transformations. It cant travel faster than that invariant speed because as you travel faster and faster you never catch up to it due to its invariance. Another way of looking at it is C, by definition, is the speed of light in a vacuum from a stationary source. Normal velocities go faster if their source goes faster - light does not and that's why light or anything else cant go faster than C. Its a perfectly valid question - but for some reason you chose to think its not valid. With your educational background how you made such as error beats me.Why can’t something travel faster than itself? It’s a ridiculous question.

The question to ask is why is that invariant speed the speed of light. Symmetry considerations prove such a speed exists, that it is the speed of light is the follow up question which this thread has tried to answer.

Thanks

Bill