Albert Einstein’s special theory of relativity(time dilation)

Before this theory was proposed everyone believed that time is constant everywhere. But this is not true. The theory of special relativity is an extension to the very fundamental concept ie Speed = Distance / Time.This means that distance and time are inversely proportional. Imagine that you are standing still and holding the light.  A light clock would have two mirrors and beam of light travelling between these mirrors. The beam of light would travel the length between the two mirrors of the clock say d in time t with speed s. Suppose you take this light clock to space on a spaceship. The speed of spaceship is moving with the speed of light. In this case, the distance traveled by the light will be more. As the position of mirrors would change as the spaceship is in motion and the beam of light is following a zigzag path instead of a straight path. So we see the beam of light traveled more distance. But there is a catch! The speed of light is always constant. So how could the beam of light travel a longer distance with the same speed? This answers the question that can we travel time? So if you have a twin brother back at earth. He would have spent a longer time on earth and hence he would age more. But you would turn younger to him as you spent a lesser time on the spaceship. So when you reach earth back, you would step in future! Scientists thought of capitalizing on the postulates of the theory of special relativity. They have come with multiple concepts.