Changes

== History ==

== History ==

In the beginning of the last century the two assumption mentioned before where found experimentally in the form of the Maxwell equations, which describe electromagnetic waves. The general idea at that point was that any wave is carried by some substance. This thought of substance was called [[aether (science)|luminiferous aether]]. However, as the earth is moving trough space, there should be a difference in the light wavelength when measured at noon, at evening and at night at the same geographic location. However the [[Michelson-Morley experiment]] did reject the aether hypothesis. With this rejection it became an inevitable fact that equations descibing physics, which where fitting to a three dimensional space with a single timeframe for all observers exist. The mathematical framework was developed by [[Henri Poincaré]] and [[Hendrik Lorentz]], which [[Albert Einstein]] connected to the experimental observations.

In the beginning of the last century the two assumption mentioned before where found experimentally in the form of the Maxwell equations, which describe electromagnetic waves. The general idea at that point was that any wave is carried by some substance. This thought of substance was called [[aether (science)|luminiferous aether]]. However, as the earth is moving trough space, there should be a difference in the interferometrically determined light wavelength, when measured at noon, at evening and at night at the same geographic location. However the [[Michelson-Morley experiment]] did reject the aether hypothesis. With this rejection it became an inevitable fact that equations descibing physics, which where fitting to a three dimensional space with a single timeframe for all observers exist. The mathematical framework was developed by [[Henri Poincaré]] and [[Hendrik Lorentz]], which [[Albert Einstein]] connected to the experimental observations.

== Relation between energy and mass ==

== Relation between energy and mass ==