Time Travel
According to the famous physicist Albert Einstein in this universe time is not constant. In his theory of general relativity he proposed that time is relative, depending on the size of space bodies such as planets, stars, black hole etc. the gravitational force is being changed. The space bodies which possess more gravity, there time gets slow. From this concept scientists started to think of time travel. Not only the scientists, most of the people are fascinating about time travel. Though it is a hypothetical concept scientists suggest few theories to do his. If any space ship can travel at the speed of light then the people inside that ship can experience time travel due to the time dilation process. Time dilation refers to the variance in the lapsed time which is measured by two different clocks. Apart from this if a space ship travels near a celestial body like a black hole which possess high gravitational force , the person sitting in that space ship can experience time travel because previously mentioned that time gets slow near a space body with high gravitational force. A black hole possess highly gravitational force, even the light can't escape from it. For the person near black hole time passes slow.If he spends few hours near a black hole, when he comes back to earth there he can see that few years have gone. All these concepts of time travel are only in theories, none of the process are performed in practical.
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