Also known as the "Novikov Self-Consistency Principle," this theory posits that a time traveler cannot create a closed timelike curve, meaning that any events that occur as a result of time travel must be self-consistent with the events that occurred before them.
In other words, if you travel back in time and kill your own grandfather, you will never have been born, but since you were never born, you could never have traveled back in time to kill your grandfather. The paradox is "self-consistent" because it doesn't create any logical inconsistencies.
Novikov's theory attempts to solve the grandfather paradox by introducing a kind of "temporal censorship" that prevents closed timelike curves from forming.
But don't just take our word for it - explore the experimental evidence supporting this theory for yourself!
Or, if you're feeling adventurous, try to solve some temporal paradoxes and see where it takes you!