Time Travel
Time travel has been a popular topic for science fictions, films & TV series for decades. Before going to the time travel topic we should understand what is meant by the time. While most people think of time as a constant, physicist Albert Einstein showed that time is an illusion. Einstein's theory of special relativity says that time slows down or speeds up depending on how fast you move relative to something else. According to most of the scientist t ravel into the past is probably impossible. Even if it were possible, Hawking and others have argued that you could never travel back before the moment your time machine was built. The easiest and most practical way to get to the far future is to go fast. According to Einstein’s theory of special relativity, if one were to leave Earth in a spacecraft travelling at an appreciable fraction of light-speed, turn around and come back, only a few years might have passed on board but many years could have gone