Hafele-Keating Experiment (1971): Scientists flew atomic clocks on commercial jets around the world to test Einstein’s relativity. Results confirmed time dilation: clocks moving eastward (with Earth’s rotation) ran slower than stationary ones, while westward clocks ran faster, due to velocity and gravitational differences. This proved time isn’t absolute; motion and gravity affect its flow. Though nanoseconds were gained or lost, it validated that high-speed travel literally shifts one into the future relative to others. This foundational experiment underpins GPS technology and remains direct evidence that time travel to the future, in a limited sense, is scientifically possible through relativistic effects.
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