What you're thinking of is a UFOlogist, and there are no qualifications as it's not an actual scientific field, it's simply civillian research of the phenomenon. I recommend a basic understanding of UFO's, the history of UFO reports, and a neutral stance - most real UFOlogists don't jump to conclusions when investigating them.
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appendix
No qualifations are needed
how to become a dinner lady
Luck
DNA
none
GCSE's
what answer
you require a bachelors degree
Degree
book