23 oct. 1905 - Albert Einstein

Description:

publishes his Special Theory of Relativity, in which he generalizes Galileo's Principle of Relativity (that all uniform motion is relative, and that there is no absolute and well-defined state of rest) from mechanics to all the laws of physics, and incorporates the principle that the speed of light is the same for all inertial observers regardless of the state of motion of the source.