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Special relativity

Special relativity inter-relates space and time in such a way that the speed of light is constant, and the theory leads to situations where two observers can disagree over time intervals and distances between events, but without ever disagreeing about what events actually happened.

It shows that time can pass more slowly if an observer is moving, depending on their relative speed.

The theory also predicts the famous equation E=mc2.

Note: This article excerpts material from the Wikipedia article "Special relativity", which is released under the GNU Free Documentation License.

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