Name of a physical theory about the structure of space, formulated by Albert Einstein in the early years of this century. It can be considered as the greatest and greatest innovation in the field of physical sciences after the contributions of Galileo and Newton.

Relativity was formulated twice. In the so-called special relativity of 1905, the fundamental principle is stated that the speed of light is a constant (300,000 km / sec.) That does not depend on the reference system considered; it also constitutes an unreachable limit for a material body and, as it approaches this limit value, a phenomenon known as time dilation is experienced.

This last enunciation has given life to the famous paradox of the twins, according to which a man traveling at speeds close to that of light, upon returning to Earth would find his aged twin a number of years that depends on the speed with the one that has developed the trip.

◄ PreviousNext ►
Refractor (telescope)Atomic clock