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1. General Relativity

   Linked via "Pound–Rebka experiment"

   Gravitational Redshift
   Time dilation is a crucial component of GR. Clocks run slower in regions of stronger gravitational potential (deeper in a gravity well). This effect, known as gravitational redshift, means light emitted from a massive body is shifted toward lower frequencies (redder) when observed by a distant observer where gravity is weaker. This has been precisely measured using the Pound–Rebka experiment.
   Black Holes and Singularities