Time involves mass and change; photons have zero mass for time to grab on to. It is interesting to consider gravitons as zero mass particles; maybe they acquire mass and that is the gravitational effect. Google says that “The vacuum speed of light is not a valid rest frame, because it’s a frame that can never be at rest.”
Gravity also travels at the speed of light. Light speed seems to be the standard speed of zero mass particles, that all at any rate seem to be elements of a field when measured at a particular location. It’s funny that the wavefunction collapse doesn’t apply to massless particles unless they interact with matter.
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