The special theory of relativity or special relativity is a physical theory which states the relationship between space and time. This is often termed as STR theory. Special theory of relativity is based on two postulates –
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ynamics of Moving Bodies”. Special relativity implies consequences of mass-energy equivalence, relativity of simultaneity, length contraction, and a universal speed limit. The conventional notion of absolute universal time is replaced by the notion of a time that is dependent on the reference frame and spatial position.