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In 1977, at the First International UFO Congress in Chicago, Hynek presented his thoughts in his speech "What I Really Believe About UFOs". "I do believe", he said, "that the UFO phenomenon as a whole is real, but I do not mean necessarily that it's just one thing. We must ask whether the diversity of observed UFOs ... all spring from the same basic source, as do weather phenomena, which all originate in the atmosphere", or whether they differ "as a rain shower differs from a meteor, which in turn differs from a cosmic-ray shower." We must not ask, Hynek said, simply which hypothesis can explain the most facts, but rather which hypothesis can explain the most puzzling facts.[13]
Regarding hypotheses of extraterrestrial intelligence (ETI) and extradimensional intelligence (EDI), Hynek continued, "There is sufficient evidence to defend both". As evidence for the ETI hypothesis, he mentioned the cases involving radar as good evidence of something solid, as well as the cases of physical evidence. Then he turned to defending the EDI hypothesis: in addition to the observations of materialization and dematerialization, he cited the "poltergeist" phenomenon experienced by some people after a close encounter; the photographs of UFOs, sometimes in only one frame, and not seen by witnesses; the changing of form in front of witnesses; the puzzling question of telepathic communication; that in close encounters of the third kind, the creatures seem to be at home in Earth's gravity and atmosphere; the sudden stillness in the presence of the craft; levitation of cars or people; and the development by some of psychic abilities after an encounter. "Do we have two aspects of one phenomenon or two different sets of phenomena?" Hynek asked.[14]
