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Special Theory of Relativity

A comprehensive theory of space and time that replaces Newtonian mechanics when velocities get very large.

The laws of physics are the same for all inertial reference systems.
Second Postulate of Special Relativity: The speed of light in a vacuum is a constant regardless of the speed of the source or the speed of the observer.

See also: Einstein, Albert, General Theory of Relativity, Newtons Laws of Motion.