IS TIME TRAVEL POSSIBLE?

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The concept of time travel can be understood by the concept of time dilation.

 So what is time dilation?

 Time dilation, in the theory of special relativity , the “slowing down” of a clock as determined by an observer who is in relative motion with respect to that clock.
     Or 
           It is a difference in the elapsed time measured by two clocks, either due to them having a velocity relative to each other, or by there being a gravitational potential difference between their locations.

In simple language we can say that time dilation is the slowing of time. For example let a object or a vehicle is moving with very high speed (approx with the speed of light). For the person who is inside the object, the object is at rest but for the observer he is in motion. As the object is moving with speed of light the time is slow for the rider as compare to the observer.

 Albert Einstein in 1906 gave his theory on relativity 
According this theory the three laws of motion given by Issac Newton are not applicable in the case of high speed.
 This theory gave us new concepts like 
1) If the object is moving with the speed of the light it seems to be smaller as compare to its original size to the observer.
2) The mass is increases with speed which means if a object is in motion and moving with the speed of light it's mass will increase.

 If we somehow make possible to move with very high speed more than the speed of light then may be we can travel in time. 

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