Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Normal
The problem here is that you are going into the question already knowing the answer you are going to propose. If it happened before people invented airplanes, it must be human stupidity. If it happened after, it must be experimental secret aircraft. If you aren't going to keep an open mind about what they may be seeing, there is no way to debate what is happening. Your explanations don't really explain the Christopher Columbus sighting. In 1492 people had a very good understanding of meteors, and the way he describes it, it was certainly no meteor. He reported a light that moved up and down, changed directions, disappeared and reappeared numerous times over the course of the night. As for Alexander, there were reports of 2 silver craft that dove at his armies until the war elephants panicked and refused to cross the river this happened at. They were described as "great shining silvery shields, spitting fire around the rims... things that came from the skies and returned to the skies." Doesn't really sound like natural phenomenon to me.