It varies but a science PhD in your desired field would certainly not go amiss.
what qualification are needed by scientists
There are no qualifications needed, only sufficient experience to get the job.
I personally taught myself when it came to photographing weddings in Raleigh. A lot of research and getting familiar with my camera equipment was key.
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.
No qualifations are needed
none
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What type of job traning and Career Qualifications is needed for photography??? Practice makes perfect!!!
The qualifications that are needed to be an art director are to have great experience with art, be educated, trained and prepared to give an art class.