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Is Time Travel Possible? Testing the ‘Grandfather Paradox’

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Published on Jul 24, 2014

Seth Lloyd
July 16, 2014

Time travel is a science fiction staple, inspiring the plots of countless books, movies and Star Trek episodes. But while basic physics allows for the possibility of moving through time, practical concerns like the “Grandfather Paradox,” in which a traveler jumps back in time, kills his grandfather and therefore prevents his own existence, seem to stand in the way. Self-described “quantum mechanic” Seth Lloyd looks at an alternate mode of time travel that eliminates any events that could later prove paradoxical, making this phenomenon both theoretically possible and creatively irresistible, whether you’re an astrophysicist or just a daydreamer.

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