We don't need to "define" things to be able to descibe their characteristics and compare those characteristics to things we do know about.I have always understood that the suffix "-ology" means "Study of..." and that the "U" in UFO stands for "Unknown". So the word "UFOlogy" denotes the study of unknown flying things.
How is it possible to study the unknown scientifically?
Wouldn't one need to define the flying objects before attempting to study them? Or is UFOlogy the study of anecdotes about UFOs; in which case it should be re-named: "Extraordinology" perhaps?
And indeed we can come up with falsifyable hypotheses to do just that. For example if the UFO debunkers are correct in their belief that UFO reports can be principally explained as the result of misidentified mundane objects, then there should be no difference on defined characterisitics (speed, shape, etc) between those reports that have plausible mundane explanations and those that don't. That is a scientifically testable (falsifyable) scientific hypothesis.
...but of course we can scientifically explore the "unknown" - and ideed science is doing that right now (think the LHC for example and Dark Matter and Dark Energy).
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