What is the Theory of Relativity?

You've probably all heard of Albert Einstein and his Theory of Relativity before. It is this theory that helped scientists to answer to the mysteries of the Universe. So, what is this theory?

Well, to put it simply, one of Einstein's great insights was to realize that the movement of an object is a relative one. For example, suppose you are travelling in a car with your father. As you see things moving away, you can say you are moving. But, for your father, you are not moving at all. That means if you are moving along with a body, you cannot feel the motion. In other words, motion is relative. Again, Einstein observed that the fastest thing in the Universe is light, and that light travels at a constant speed any where in the Universe.

He also said that, matter and energy are different forms of the same thing. Matter or mass can be turned into energy, and energy into mass. According to Einstein, you multiply the mass, say m, by the square of the speed of light (c), which is constant, to get the amount of energy, that is E. It is written as E=mc(2). This is a rough idea of the Theory of Relativity.