In physics, special relativity (SR, also known as the special theory of relativity or STR) is the accepted physical theory regarding the relationship between space and time. It is based on two postulates: (1) that the laws of physics are invariant (i.e., identical) in all inertial systems
(non-accelerating frames of reference); and (2) that the speed of light
in a vacuum is the same for all observers, regardless of the motion of
the light source. It was originally proposed in 1905 by Albert Einstein in the paper "On the Electrodynamics of Moving Bodies".[1] The inconsistency of classical mechanics with Maxwell’s equations of electromagnetism
led to the development of special relativity, which corrects classical
mechanics to handle situations involving motions nearing the speed of
light. As of today, special relativity is the most accurate model of
motion at any speed. Even so, classical mechanics is still useful (due
to its simplicity and high accuracy) as an approximation at small
velocities relative to the speed of light.
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