Time travel: what’s the logic?
I saw a program called “The Universe” on H2 yesterday. Physicists talked about the theory of relativity and time travel. One prominent physicist said “don’t be shocked if someone from the future comes knocking on your door one day.” I must say I don’t understand the logic behind time travel or this statement.
Suppose time travel will happen some day in the future then why have we not yet seen someone from future? One argument might be that time is infinite and we are living within a small speck in the infinite time dimension so we have not yet seen anyone who decided to visit this specific speck. May be. But what about visiting during my grandfather’s time? Or his grandfather? Or his father … i.e., why don’t we have a single recorded event in all of human civilization of someone from future visiting us? The only explanation I have is that they haven’t revealed that they are visiting from the future. But why not? Why does revealing the fact affect time travel?
I must say I don’t get the logic behind time travel. If time travel existed, then we should have already seen the future and also obtained time travel technology from someone in the future. How can time travel be logical? Someone please enlighten me.
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