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Time dilation

Does time dilation mean that time actually passes more slowly in a moving inertial reference frame, or that it seems to move slower? Would a mechanical clock be affected by time dilation? If you are traveling away from Earth at 0.7c does your heart rate slow down?

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You have just touched one of the most perplexing and fundamental concepts of relativity. The question is not simply if time moves slower in a moving reference frame but is actually who takes the measurement.

For someone who is in a moving frame relative to another frame, everything ...

Solution Summary

The question is not simply if time moves slower in a moving reference frame but is actually who takes the measurement.

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