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I believe that the most obvious observation of time dilation is in particle accelerators. The particles move so fast that different processes occur slower than when they are not moving, or moving much more slowly.Other than that, I understand that very precise experiments were also done with clocks, which were taken on moving airplanes.

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8y ago
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8y ago

-- Unstable particles in the laboratory are observed to live longer when traveling
at high speeds than when at rest or traveling at lower speeds. The change in their
half-life agrees with the change predicted by the relativistic math.

-- Atomic clocks carried aboard aircraft are observed to lose an amount of time
that depends on the speed and duration of the flight. The loss agrees with the
change predicted by the relativistic math.

-- The successful operation of the Global Positioning System (GPS) depends on
the accuracy of time standards (clocks) carried aboard each GPS satellite.
The system doesn't work unless the clocks aboard the satellites are corrected
for the relativistic time dilation due to their orbital speeds. Then it works.

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Q: How was time dilation proven?
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