Temporal paradox

A temporal paradox, is a time paradox, or time travel paradox. It is a paradox, or logical contradiction, of time and time travel.

Temporal paradoxes fall into two broad groups. Consistency paradoxes (example: the grandfather paradox) and causal loops.^[1]

A causal loop is a paradox of time travel. It occurs when a future event is the cause of a past event, which in turn is the cause of the future event. Both events then exist in spacetime, but their origin cannot be known.^[1][2][3][4]