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In Special Relativity we say that "moving clocks run slow". This means that

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		Any process used to keep time will appear to happen more slowly in a moving object, when seen by an observer not moving with the object.
		The clock on a spaceship will appear to run slowly to the astronauts on the spaceship.
		The duration of any "clock" will seem different to different observers moving with respect to the clock and to each other.
		It is not possible to have events that are simultaneously occuring as seen by all observers in motion with respect to each other and to the event.

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