UFO spewing thunder and lightning

What is a UFO? This is an unidentified flying object. If something flew past you, and you could not identify what it is, then it is, by definition, a UFO. After all, it happens that something flies, but you don’t know what. It is very presumptuous to think that we are alone in the Galaxy, let alone the Universe. And of course, there are civilizations more advanced than we are. It's just that we hardly see their ships if they don't want to.
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