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He quit heading the Pentagon’s UFO office. Now a report of his has shaken up ufology
(www.theguardian.com)
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Scientific skepticism or rational skepticism, sometimes referred to as skeptical inquiry, is a position in which one questions the veracity of claims lacking empirical evidence.
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"A wise man proportions his belief to the evidence." -David Hume
I'm not sure, I understand your question right, but yes, UAPs can originate from Earth. If someone sees a weather balloon and they send a pixelated photo to the government, because they think it's aliens or a Russian drone strike or something, that will be filed as an aerial phenomenon, which couldn't be identified.
That's also the meaning of "UFO" – Unidentified Flying Object – but I guess, it doesn't quite encompass all phenomenons, such as weird clouds or a comet burning up.