What is time dilation? | Live Science

The time extension refers to the seemingly strange fact that time passes at different rates to different observers depending on their relative motion or position in the gravitational field.

This is how it works. Time is relative. As intuitive as it sounds, it is a consequence of Einstein theory of relativity. In everyday life, we are used to the fact that speed is relative – so a car traveling at 60 mph (97 km / h) relative to a stationary observer, for example, would be considered to be moving at 120 mph (193 km / h) in the opposite direction.

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