Special relativity

In physics, the special theory of relativity, or special relativity for short, is a scientific theory of the relationship between space and time. In Albert Einstein's 1905 treatment, the theory is presented as being based on just two postulates:

  1. The laws of physics are invariant (identical) in all inertial frames of reference (that is, frames of reference with no acceleration).
  2. The speed of light in vacuum is the same for all observers, regardless of the motion of light source or observer.
Special relativity
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The first postulate was first formulated by Galileo Galilei (see Galilean invariance).

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