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In fiction, time travel is typically achieved through the use of a device known as a time machine. The idea of a time machine was popularized by H. G. Wells's 1895 novel The Time Machine. [1] It is uncertain whether time travel to the past would be physically possible. Such travel, if at all feasible, may give rise to questions of causality.
Quantum mechanics of time travel. The theoretical study of time travel generally follows the laws of general relativity. Quantum mechanics requires physicists to solve equations describing how probabilities behave along closed timelike curves (CTCs), theoretical loops in spacetime that might make it possible to travel through time. [1][2][3][4 ...
Class II Impossibilities are “technologies that sit at the very edge of our understanding of the physical world", possibly taking thousands or millions of years to become available. [10] Such a technology is time travel. Einstein’s equations do show that time travel is possible. This would not be developed for a time scale of centuries or ...
Although traveling back in time is almost-universally considered physically impossible, theoretical research has explored whether it might be possible. [8] It has also been speculated by scientists such as J. Richard Gott, Ronald Mallet [9] and others [10] [11] that humans may someday be able to time travel to the past. [12]
In his own book, Time Travel in Einstein's Universe: The Physical Possibilities of Travel Through Time, Gott argues that travel to the past is quite possible, although probably only after the construction of a working device (during its existence), and certainly not onto the time traveler's own past timeline (he argues that either the many ...
Theoretically, scientists say time travel is possible. The challenging part is recreating time travel in real life.
Chronology protection conjecture. The chronology protection conjecture is a hypothesis first proposed by Stephen Hawking that laws of physics beyond those of standard general relativity prevent time travel on all but microscopic scales—even when the latter theory states that it should be possible (such as in scenarios where faster than light ...
The scientists are saying there are many parallel universes where every conceivable outcome occurs and these different universes interact with one another. Scientists say time travel is possible ...