The term 'unidentified flying object' (UFO) has been in use since 1947, following the Kenneth Arnold incident which popularized terms like 'flying saucers' or 'flying discs' during the late 1940s and 1950s.

Authors

• Person: Not available Organization: Wikipedia
  Unidentified flying object - Wikipedia

Sources

• Unidentified flying object - Wikipedia en.wikipedia.org Wikipedia via serper

Referenced by nodes (1)

• Kenneth Arnold UFO sighting 1947 event