A disc-shaped object repeatedly appeared over a searchlight in Norwood, Ohio, tracked by Army instruments and witnessed by hundreds over several months.
Pluto discoverer Clyde Tombaugh observed a formation of yellowish-green rectangular lights moving silently across the New Mexico sky, baffling one of history's most accomplished astronomical observers.
USAF pilot George Gorman engaged in a 27-minute aerial dogfight with a maneuvering light over Fargo that outperformed his P-51 Mustang.
Captain Thomas Mantell died pursuing a large metallic UFO over Kentucky, becoming the first pilot death attributed to a UFO chase.
Private pilot Kenneth Arnold's sighting of nine unusual objects near Mount Rainier launched the modern UFO era and coined the term 'flying saucers.'
Over 2,000 reports of rocket-shaped objects over Scandinavia prompted a Swedish military investigation that concluded 80% were unexplained.