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The key to the whole idea is wormholes—specifically, a type of wormhole called a ring wormhole. Now, wormholes are already entirely theoretical, so this discussion is going to get weird.
This occurs when the two wormhole mouths, call them A and B, have been moved in such a way that it becomes possible for a particle or wave moving at the speed of light to enter mouth B at some time T 2 and exit through mouth A at an earlier time T 1, then travel back towards mouth B through ordinary space, and arrive at mouth B at the same time ...
If traversable wormholes exist, they might allow time travel. [33] A proposed time-travel machine using a traversable wormhole might hypothetically work in the following way: One end of the wormhole is accelerated to some significant fraction of the speed of light, perhaps with some advanced propulsion system, and then brought back to the point ...
The Final Countdown (1980): A science-fiction time-travel movie in which the aircraft carrier USS Nimitz passes through a wormhole back to the eve of the Japanese attack on Pearl Harbor. The anomaly returns and sends it back into the present, before it has a chance to affect the outcome.
Ronald Mallett is still working on rotating lasers to travel back in time. His working theory is based on Albert Einstein’s relativity discussion.
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Paul Davies, How to build a time machine, 2002, Penguin popular science, ISBN 0-14-100534-3 gives a very brief non-mathematical description of Gott's alternative; the specific setup is not intended by Gott as the best-engineered approach to moving backwards in time, rather, it is a theoretical argument for a non-wormhole means of time travel. J ...
Smeenk uses the term "predestination paradox" to refer specifically to situations in which a time traveler goes back in time to try to prevent some event in the past. [7] The "predestination paradox" is a concept in time travel and temporal mechanics, often explored in science fiction.