Define theory of relativity

Special Theory Of Relativity

Einstein first introduced this term in the year 1905. It is a theorem that deals with the structure of space-time. Einstein explained this theory based on two postulates –

• The laws of physics are the same for all irrespective of the velocity of the observer.
• The speed of light is always constant regardless of the motion of the light source or the motion of the observer.

General Theory Of Relativity

General Relativity theory developed by Einstein in the year 1907-1915 states that being at rest in the gravitational field and accelerating are identical physically. For example, an observer can see the ball fall the same way on the rocket and on Earth. This is due to the acceleration of the rocket which is equal to 9.8 m/s². This theory relates Newton’s gravitational theory and special relativity.