> Did the path between emission and reception change the photon? Or did it change our relation to the photon? That’s irrelevant navel gazing: the operator whic

> Did the path between emission and reception change the photon? Or did it change our relation to the photon? That’s irrelevant navel gazing: the operator which describes the change depends on the continuous path between. > Strange as that seems, given conservation of energy still holds. I don’t believe it does when factoring in expansion — or at least, that hasn’t been shown. https://www.youtube.com/watch?v=ZYM6HMLgIKA https://www.youtube.com/watch?v=ZYM6HMLgIKA