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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The term unidentified flying object refers to any flying objects or optical phenomenons which are not identified, however, the term is widely used to describe spacecrafts which are believed to have extraterrestrial origin. Although the majority of UFO sightings are identified with a known astronomical, atmospheric or human-caused phenomenon, the interest in alien spacecrafts and extraterrestrial beings has become a part of popular culture. Learn more about UFOs and the most famous UFO incidents in this book.