[post_page_title]The grandfather paradox[/post_page_title]
Another hypothetical obstacle with time travel is the grandfather paradox, which says that a time traveler going backwards into the past may kill their own grandfather, even accidentally. Naturally, if the time traveler’s grandfather was killed, then their father or mother would never be born – leading to they themselves never being born. But if they were never born, it continues, how could they have existed to travel through time and kill their grandfather in the first place? The paradox has been expanded to include any action that alters the past.
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