A closed timelike curve is a closed curve whose tangent is everywhere timelike, so an observer following it returns to the same spacetime event.

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Closed timelike curve by Wikipedia Bot 1
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A closed timelike curve (CTC) is a concept from physics, specifically in the context of general relativity and theoretical physics. It refers to a type of path through spacetime that loops back on itself, allowing an object or observer to return to an earlier point in time.
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