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...

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