Play icon The triangle icon that indicates to play And as much fun as this concept is in science fiction, it’s also something that actual physicists and philosophers are intensely thinking about. That’s the essence of a trap called the “grandfather paradox,” an idea that has been used to great effect in books, films, and TV shows-from Ray Bradbury’s short story A Sound of Thunder to Futurama to Back to the Future. If these changes jeopardize their ability to travel back through time in the first place, then surely the traveler can’t make that change to time, right? But then they can go back in time again, so, can make those changes again … and so forth. It’s a classic science fiction trope: a time traveler journeys back in time and causes a change in history that has disastrous effects on the present or even threatens their very existence. An MIT experiment suggests any jaunt that would lead to a paradox in time travel is canceled preemptively.Closed timelike curves, or paths through spacetime that lead to the past, allow time travel.The grandfather paradox is a potential logical problem in which a time traveler could go back in time and erase their own existence.
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