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. 
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.
Other paradoxes of time travel are a variation of the Fermi paradox, and paradoxes of free will that stem from causal loops such as Newcomb's paradox.
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.