What is the interval between two events?

By Forinfos - 21/04/2025 - 0 comments

In the theory of relativity in the study of physics, the interval between two events is called proper time. Proper time is based on a clock that measures both events.

Proper time is measured by a clock that creates the same point of reference, and is used to compare the two events based on their length. For one common example of measuring proper time, consider a spaceship leaving Earth with one person on it and one person left behind, measuring how long it takes. The spaceship goes to a planet five light years away. The person on Earth measures a time that reads five light years, and the person on the spaceship measures a time that is much shorter. The time the person on the spaceship measures is the proper time, because he was present at both the start and finish.

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