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