J. Allen Hynek's systematic classification of UFO reports — by the astronomer who served as the US Air Force's scientific consultant on UFOs and coined the term 'Close Encounter.'
Hynek classification system: Daylight Discs, Nocturnal Lights, Radar-Visual cases, Close Encounters of the First Kind (sighting), Second Kind (physical evidence), Third Kind (occupants). 'Close Encounter of the Third Kind' — the phrase Spielberg borrowed for his film. Hynek's transformation from debunker (Project Blue Book consultant) to serious advocate for scientific investigation: the data forced his reassessment.
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