Quote:
Originally Posted by JesseK
And doesn't this imply that photons may have an infinitesimally small lifetime if they were to stop moving?
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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.