Quote:
Originally Posted by Archy
although you can measure the wavelength/frequency of the photon when it arrives, it is impossible to determine what the original wavelength/frequency of the photon was when it left the source, though you may speculate what it was.
Therefore you cannot determine the relative ages of photons X and Y
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Well, ok .. so that doesn't really provide me with any insights into explaining anything I observe …
So I'm now in alignment with Steven's question … how is this relevant in my quest to explain what I might see ?
Cheers