Submission statement:
This is a compilation of UFOs, not alien spacecraft. Maybe all of them have a prosaic explanation. That being said, the post is also kind of an answer to ‘there is no evidence’. There is a potential body of evidence that could be revelatory, patterns to be found, or not, but at the moment, there is really no one publicly storing the data, analyzing it, categorizing it, nor any place to contribute to this kind of initiative. A lot of videos and sighting descriptions are being lost. Even having well-documented libraries of UFOs confirmed as prosaic objects would be incredibly useful for everyone.
Sources (not in order):
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