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abduction aboard Adamski Air Force Base aircraft airship alien alleged Allen Hynek appeared astronomer ball lightning Barney Hill began believe Bertrand Betty Andreasson Betty Hill called camera chase claimed close encounter concluded Condon Condon committee contactees craft creatures crew debunker described disk earth event evidence Exeter explanation extraterrestrial feet fighters flying saucer Fortean glowing ground helicopter hoax Hopkins hovering hypnosis incident intelligence Keyhoe Klass land later look Lubbock lights Menzel miles per hour moving Muscarello Mutual UFO Network mysterious nearby NICAP night observed officers phenomena photograph Picture Library pilot planets police Project Blue Book Project Grudge Project Sign radar radio Roswell Ruppelt scientific scientists seemed seen shape ship skeptics space spacecraft spaceships Spaur stars story strange swamp gas told took UFO investigations UFO phenomenon UFO reports UFO research UFO sightings ufologists unidentified flying objects University visitors Washington watched wave witnesses