A Close Encounter of the first kind is a close encounter in which visual sightings of an unidentified flying object, seemingly less than 500 feet away, show an appreciable angular extension and considerable detail.
- ↑ J. Allen Hynek, The UFO Experience: A Scientific Enquiry, Ballantine Books, 1972, pp. 98-9.
- Informania: Aliens, page 18
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