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"Local time" - at velocity c?
Exactly how much "local time" has a photon which has travelled from UDFj-39546284 experienced?
Is that photon even an isotropic observer?
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Local time
"Local time" - at velocity c?
Exactly how much "local time" has a photon which has travelled from UDFj-39546284 experienced?
Is that photon even an isotropic observer?