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Please read this carefully - "there is nothing that we know, which would make it impossible for us to travel in time".
This may not be enough to say that time travel is theoretically feasible, but what it does mean is that there is nothing to contradict the claim that time travel is theoretically feasible. For me, that much hope is enough to begin with.
If your destination is in the North, which directions would you travel? Before you say North, think again. You can reach the same spot traveling Southwards too. Before we came to understand that the Earth is round, that would have appeared a fantasy, but once you understand the logic, it is all so simple - a child's play, isn't it?
Time travel could also turn out to be a simple concept - once we are able to understand it.
THE CONCEPT OF TIME TRAVEL
Before we try to understand what we mean by time, let us conceptualize what we are talking about. You can travel in time in two ways, either you remain the same while the rest of universe moves to a different time, or, the rest of the world remains normal, while you undergo a change in time. Since a man's lifespan is short, he can not possibly travel too distant in time by using the second strategy, but he CAN TRAVEL some distance, however small it may be.
Next we also need to realize that while reality is not the same as perception, it is possible for the two of them to become so approximated that there remains no difference between the two. Given this possibility, it is possible to recreate a perception at a given time that actually resembles another time frame. Simply put, the two dimensional audio-visual experience of a movie theater can be developed further to create the illusion of time-travel. That unfortunately will remain only an illusion, but believe me, such illusions may be confronting you pretty soon.
Here I will focus only on reality and not on illusion.
UNDERSTANDING TIME
As far as the actual time travel is considered, the real key to it lies in knowing how to manipulate time.
Now time itself is nothing but a relative rate of infinite changes taking place in the universe. If all those changes start happening exactly in the reverse order then the time will start moving in the opposite direction.
For a simple analogy, consider how you can change the sequence of events in a movie. In the normal course, the film moves forward (in one direction). If you change the direction, the movie goes in the reverse direction.
The
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