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The Grandfather Paradox

This paradox is often used to prove that time travel can't exist. Another "proof" is that we've never been visited by people from the future, which goes to show that time travel will "never" be possible. By changing the past, you change the future in which you are able to travel into the past.

In Science Fiction treatments of this subject, there are some typical resolutions :

  • The killer would still be alive, but unable to leave the past because the time stream was altered.
  • When the person changes the past, he (she) returns to an altered future where he never existed, or where time travel never existed.
  • The time traveler returns to an alternate future, where he is a different person, having had one different biological parent/grandparent.
  • For some reason, the murder never happens. They miss, or run out of bullets, or kill the wrong person (protection of the timeline). In at least one instance, changing the past crashes the time travel method and throws the person back to the future.

Time Loop - when she "did" kill her grandmother, she wouldn't have been born, so then she wouldn't have killed her, so she WOULD have been born, so did kill her, and was erased out of existence, but then was born (and so forth).

Analogy to Self-Murder - That's just like killing yourself, so it would have to be an alternate universe, or one where she was born as another person in another family.

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