Recent content by Kitesurfer

Yes. A photon that was emitted 13 plus billions years ago, right after the initial condensation of electrons / protons that made the universe transparent to photons and enabled its propagation without scattering on mass particles (circa 300 thousands years after the big bang), is received by...

Do photons age? Time has no meaning in photon rest frame, nor for any zero mass particle moving at c. Time is "experienced" only by mass particles. Therefore, only interaction of photon and a mass particle yields information about time.