What happens when a time traveler does things in the past that prevent them from doing them in the first place?
An apparent contradiction, or a logical contradiction, that is associated with the idea of time and time travel.
Grandfather paradox:
You travel back in time and kill your grandfather before he conceives one of your parents, which precludes your own conception and, therefore, you couldn't go back in time and kill your grandfather.
A paradox of time travel in which inconsistencies emerge through changing the past. The paradox regards any action that alters the past, since there is a contradiction whenever the past becomes different from the way it was.
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Idioms, Fallacies, and Paradoxes
RandomAll definitions are 100% written by Wikipedia, not my own words.
