Special-relativity Definition

The physical theory of space and time developed by Albert Einstein, based on the postulates that all the laws of physics are equally valid in all frames of reference moving at a uniform velocity and that the speed of light from a uniformly moving source is always the same, regardless of how fast or slow the source or its observer is moving. The theory has as consequences the relativistic mass increase of rapidly moving objects, the Lorentz-FitzGerald contraction, time dilatation, and the principle of mass-energy equivalence.
American Heritage
Einstein's special theory of relativityspecial relativity theoryspecial theory of relativity

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