What: "Because in the vicinity ( and inside ) regions with non-zero energy-momentum space-time is curved, most notably in the time direction. If you compare two clocks, one far away and one close to the mass/energy distribution, you will find that the latter one ticks at a slower rate. That is gravitational time dilation. A photon is like an elementary clock - as it falls through a gravitational field its frequency must change, since time itself changes as compared to some far-away reference clock."

Writer: Markus Hanke

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Date: Jan 10 2014 6:39 PM