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# Time Travel: Understanding the Revolutionary “Theory of Relativity”

In my previous hub I gave an introduction to time travel possibility and now I’m going to explain its pioneer theory by great scientist ‘Albert Einstein’ which is called ‘Theory of Relativity’. The history of this theory takes us back to Galileo’s era. At that time, it was difficult for scientists to express laws of motion in mathematical form but Galileo found the way to explain these laws of motion in terms of mathematical formula. This effort of Galileo was a great step in the field of physics but when Albert Abraham Michelson and Edward Morley performed an experiment on speed of light, the world came to know that laws of motion by Galileo are not right and hence, can’t get on with speed of light.

After the three laws of motion broke down, Albert Einstein gave a statement which explained that light speed does not depend upon the observer and so he proved it mathematically. This statement is now known as ‘Theory of Relativity’. Well! It is known that only microscopic bodies without any mass can move with the speed of light and that bodies with velocity of speed has infinite mass. This phenomenon has also been tested on macroscopic bodies (e.g. human beings) but still scientists found no possibilities of time travel of macroscopic bodies. I’ll reveal the reason in one of my later hubs of this series. For now let’s know more about the great ‘theory of relativity’.

As regard time is concerned to the theory, Relativity is divided into two sub-theories; Special relativity and General Relativity. In special relativity it is said that everyone’s time is different from other’s time. This is due to the time dilation (I’ll explain it in my next hub) phenomena whose best example is Twin Paradox. And in General relativity, gravity is included. General relativity also shows the relation between space and time and explains that space resembles more like a sheet on which heavy and light bodies have been placed. Consequently, Light bodies move towards centre of dent created by heavy bodes e.g. force of attraction between earth and moon. Well this thing concludes that time passes much slowly near massive objects.

I hope I’ve conveyed this law clearly and in my next hub I’ll try to explain time dilation deeply so that you can easily understand the whole system.

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