- Techno Greek
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- Noble Member
Because the likelihood of any fast moving object in the sky (or what spectators believe to be an object) being an alien ship is much lower than it being something mundane.
"Alien ship" is a very unlikely and complex answer that would take a lot to prove true. Swamp gas, weather balloon, reflection, ect, are all very likely and simpler answers, which is why they usually prove true easily. There are so many answers that make more sense than Alien ship that it doesn't make sense to jump to the conclusion of Alien ship.
Lots of things make light move in the sky, and our eyes usually play tricks on us when things are that far away.