My suspicion is two-fold.
It may be that civilizations tend to last only a few thousand years and there isn't much chance for any nearby ones to be extant in the same time period.
It may be that interstellar travel really isn't practical or not even possible in any reasonable way (time, energy).
It may be that civilizations tend to last only a few thousand years and there isn't much chance for any nearby ones to be extant in the same time period.
It may be that interstellar travel really isn't practical or not even possible in any reasonable way (time, energy).
Skepticism is not a position; it is an approach to claims.
Science is not a subject, but a method.
Science is not a subject, but a method.