Hello Aspirant

Theory of relativity was the theory which won Albert Einstein his Nobel prize.

According to this theory , the laws of physics are same for all non- accelerating observers and the speed of light in vacuum is independent of the motion of all observers.

Hi Nusrat,

Theory of relativity in a nutshell means that there is an invisible force that attracts objects to one another, gravity is a curving or warping of space. The more bigger an object, the more it warps the space around it.

Feel free to ask doubts in the Comment Section.

I hope this information helps you.

Good Luck!