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Galileo Galilei
Two clocks in a spaceship floating though space at 99% the speed of light. One is a atomic clock and uses light and mirrors to measure time, the other clock uses cogs and gears like a conventional clock. From the perspective from inside the ship both clocks tick and tock at the usual rate, however from the perspective of a observer that experiences the ship travel by only the atomic almost stops yet the mechanical clock keeps ticking? Basically are mechanical clocks effected with exactly the same conditions as atomic clocks or do the laws of physics differentiate between the two?