For a photon, which travels at the speed of light, there is no time.
>>For a photon, which travels at the speed of light, there is no time.
Einstein and his associates weren’t even sure that time existed.
I view it as simply the progression of state change; and that’s consistent with Special Relativity.
The energy within a system increases with velocity, and with Energy, Mass. It’s an infinite progression toward a condition where mass and energy themselves approach infinity.
The ability to change state is the ability to overcome inertia - “a body at rest tends to stay at rest”. And the observed relativistic time differential is consistent with this.