What Happens to Light and Clocks in Strong Gravity?

Which effects are measured, which are predicted, and whose viewpoint matters?

You defined proper time, compared higher and lower clocks, separated redshift from local light speed, and marked the boundary between measured weak-field effects and strong-field prediction.

Two instrumented light clocks at different gravitational depths exchange a train of photon pulses beside a supermassive black hole. — Vastward artistic reconstruction. Pulse spacing and colour indicate gravitational clock-rate and frequency comparisons; the generated scene is not a proposed black-hole mission or a scale drawing.

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