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Global Geometry. Cosmological redshift. proper time for photons:. emission and observation of the first light signal. comoving positions of emitter and observer did not change. emission and observation of the second light signal. scale factor changes. scale factor does
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Cosmological redshift proper time for photons: emission and observation of the first light signal comoving positions of emitter and observer did not change emission and observation of the second light signal scale factor changes scale factor does not change comoving x time scale factor and redshift