🇺🇸 USAF — Project Blue Book
In August 1956, a witness in Juniata, Pennsylvania, observed a circular object with a bright light that illuminated their backyard. The object had a plastic dome on top and measured about 2 to 3 feet in diameter. It ascended vertically to an altitude of 20,000 feet and then headed north at high speed. The observer watched it for three minutes before it disappeared from sight.
The description of the object did not fit any known categories, such as balloon, aircraft, or astronomical phenomenon. Due to the lack of physical evidence or additional data, investigators could not identify the object. This case remains one of the many unresolved mysteries in the history of UFO sightings.