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Wikipedia definition
1. Close encounterIn ufology, a close encounter is an event in which a person witnesses an unidentified flying object. This terminology and the system of classification behind it was started by astronomer and UFO researcher J. Allen Hynek, and was first suggested in his 1972 book The UFO Experience: A Scientific Inquiry.
Read “Close encounter” on English Wikipedia
Read “接近遭遇” on Japanese Wikipedia
Read “Close encounter” on DBpedia

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