General relativity, which also goes by the name of general theory of relativity, is the theory of gravitation created by Albert Einstein in 1916. General Relativity is said to be the current description of gravitation in today’s world physics.
To put another way, the general theory of relativity describes the interaction between matter (including fields) on the one hand and space and time on the other. The theory treats gravity as a geometric property of the curved four-dimensional space-time. German-born Albert Einstein unveiled the theory at his lecture at Prussian Academy of Sciences in 1915. To describe the curved space and time, Einstein used the differential geometry, and he went ahead with his theory quite successfully.
The general theory of relativity extends the special theory of relativity and is a sufficiently small region of space-time into this. Moreover, the theory can also be used as an extension of the Newtonian law of gravitation because of the limiting case of sufficiently small mass densities and speeds delivered through it.
- Image courtesy: physicsoftheuniverse.com
The special theory of relativity is a physical theory about the movement of bodies and fields in space and time. According to the principle of special relativity, there are not only the laws of mechanics, but also all the laws of physics present in all inertial frames of the same shape. One of the basic principal that the Special Relativity theory has is that there is no absolute space and absolute time.
- Image courtesy: ion.uwinnipeg.ca