Albert Einstain in 1916 
Albert Einstein developed the General Theory of Relativity which became one of the two pillars of modern physics with quantum mechanics. Einstein's famous formula that establishes the equivalence of mass and energy NEXT wrote the form: E = mc2
Twodimentional projection of a
threedimentional analogy of spacetime curvature described in general
relativity.

As a result of his research and development, Albert Einstein received the Nobel Prize in Physics in 1921 "for his services to Theoretical Physics, and especialmentepor his discovery of the law of the photoelectric effect" that becomes the foundation of quantum theory.
Einstein's theory of general
relativity predicted that the spacetime around Earth would be not only warped
but also twisted by the planet's rotation.

The most important concepts introduced by the theories of relativity include:
· Measurements of various quantities are relative to the velocities of observers. In particular, because space contracts and time dilates.
· The concept of spacetime should be considered together and in relation to each other.
Energy is
equal to the mass of a body times the speed of light squared.

The speed of light is nonetheless invariant, the same for all observers.