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FlowVoid ,

Redshift depends on the observer, so photons do not “experience” redshift until they are detected in an ordinary reference frame.

Furthermore, I’m not sure there is a good way to define the “experience” of a photon. Photons simply move through space until they interact with matter, and matter is never in the same reference frame as light.

Moogly OP ,

Yeah I figure “experience” is sort of ambiguous and pop science-y, but it’s how I’ve usually had it explained.

That redshift depends on the observer is obvious now that you point it out and profound too since yeah, I suppose they’re not developing across space in the way I imagined.

This makes me wonder about a potential universe with nothing except photons/radiation in it. They’d just.. never change? Even though they could do things like affect spacetime they pass through or interfere with eachother?

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