Special Relativity, What The...

[Aren Siekmeier]

Originally Posted by JesseK

And doesn't this imply that photons may have an infinitesimally small lifetime if they were to stop moving?

As Ether pointed out, a photon can never "stop moving." However, if you were to "attach a clock" to the photon and watch the clock as the photon went by, you would see that the clock is frozen. In fact these two things are related by the theory.