21 Oct 1978 Sightings
Pilot Frederick Valentich, 20, radioed Melbourne Flight Service that a large unidentified object was hovering over his Cessna 182 above Bass Strait, then the transmission ended. Neither he nor the plane was found; the Department of Transport report said the cause was not determined.
29 Dec 1980 Sightings
Betty Cash, Vickie Landrum and Landrum's grandson said a fiery object hovered over their road near Houston and was then escorted by more than 20 helicopters, and later blamed illnesses on it. Their lawsuit against the U.S. was dismissed in 1986 after agencies said they had no such aircraft.
8 Jan 1981 Sightings
A man near Trans-en-Provence in southern France told gendarmes a craft had landed briefly on his property and left marks on the ground. Gendarmes took samples, and GEPAN analyzed the soil and plants in a 1983 technical note. It remains one of France's most discussed cases.
Dec 1981 Sightings
Residents of Norway's Hessdalen valley began reporting strange lights in December 1981, up to about 20 a week into 1984. Project Hessdalen ran an instrumented field study in 1984, and Ostfold University College set up an automatic measuring station in 1998. Their cause is still debated.
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