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The time travel logic of Interstellar follows the Novikov self-consistency principle (which physicist Kip Thorne, associated with the movie, did work on). Different time travel stories handle the logic of time travel in different ways. Consider the grandfather paradox, where you go back in time and kill your grandfather. In some stories, it's possible for ...


The answer is simpler than you think. The paradox they were attempting to test (punching Platts) caused some unknown future emergency which required Granger to be contacted and brought into the loop. Granger gets into one of the boxes that Aaron was already using to go back in, which is why he can't get near to Granger (quantum entanglement?) without ...

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