Well, if we knew that exactly then we'd probably save some people a lot of time and stress. We don't know what a UFO 'is' or what they 'are' but we can speculate as to what they 'may' be. They are/either; 'Unidentified Flying Objects' [Thats obvious], Advanced Military Craft that are being tested [Most likely, look at the majority of UFO sightings and their proximity to Airforce bases, Air Fields, Air Ports, Military Compounds etc.], Strange Natural Phenomenon[Consider Ball Lightning, which is equally as bizzare as any 'UFO'], or they 'are', actually, Alien Space Craft, visitors from another Planet/Galaxy/Dimension [If your a fan of conspiracy theories then this is probably going to be your choice]. In relation to Korzybski's E- Prime we can't really define what something 'is'.
Then again, UFO Sightings are merely your brain interpreting a series of signals from a source of light that may or may not even be there, or may or may not be little green men.
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