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]
Other paradoxes of time travel are a variation of the Fermi paradox,[5] and paradoxes of free will that stem from causal loops such as Newcomb's paradox.[6]
Not a paradox
Fermi's so-called paradox is not a paradox, just a question. It does not involve logic, just the practical (empirical) fact that stellar distances are so great, and our ability to collect data from other bodies is limited.
