Black Triangle UFO Might be Man-Made

I always believe that there is life in other planets. The universe is so vast that the probability of finding an Earth-like planet isn’t remote. And among the many living planets out there, it is fun to contemplate what sort of civilization they harbor. Maybe they are ancient and superstitious. Probably primitive and basic. Or they are modern and a mirror image of our own civilization. And how about an advanced civilization many years (or millennia) ahead of us? We could only wish though that these alien civilizations will be rational enough to not start trouble, as what men tend to do in our planet. And what if they had been visiting us since time immemorial?