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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 , abbreviated as UFO or U.F.O., refers to any flying object or optical phenomenon that are not identified, however, the term is often used to describe what observers think are spacecrafts of extraterrestrial origin. UFO sightings have inspired speculations about life forms on other planets and possible contacts with extraterrestrials throughout recorded history of mankind. Learn more about ufology, the study of alien spacecrafts and extraterrestrial beings, as well as the most famous UFO incidents in history in this book.