A series of pictures of the bizarre disc were said to have been snapped by George Stock of Passaic, New Jersey, on July 29, 1952.
Now, the CIA has used one of the pictures, and a series of other historic UFO sightings, to highlight the top secret investigations it carried out in the 1940s and 1950s.
The US intelligence agency, often accused by UFO conspiracy theorists of being involved in a major cover up to hide evidence of alien life from the public, has for some reason chosen to upload some of its formerly classified UFO case files to its website.
Included among the files is that of the George Stock sighting.
Mr Stock was allegedly in his yard with a friend when they say the object appeared in the sky at about 4.30pm.
The story goes that Mr Stock ran into his house to grab his camera, before firing off five photos of the UFO.
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