Unidentified Flying Object | A Listening Practice Course

Unidentified Flying Object | A Listening Practice Course Unidentified Flying Object | A Listening Practice Course Selected Text Source: www.britannica.com Unidentified flying object (UFO), also called flying saucer, any aerial object or optical phenomenon not readily identifiable to the observer. UFOs became a major subject of interest following the development of rocketry after World War II and were thought by some researchers to be intelligent extraterrestrial life visiting Earth. Possible explanations for UFO sightings and alien abductions UFO reports have varied widely in reliability, as judged by the number of witnesses, whether the witnesses were independent of each other, the ...