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of something there. The term "UFO" has been misused and has become so much a part of popular culture that its original (and accurate) definition has been nearly completely lost. Almost everyone equates the term "UFO" with extraterrestrial spacecraft, and thus, in a perverse twist of meaning, the acronym has been transformed to mean something identified rather than something unidentified. The false but widespread assumption that a UFO is, of necessity, an alien spaceship is usually the reason the term generates such an exaggerated and confusing range of emotional responses. A recognition of the extraterrestrial hypothesis as being a valid, although unproved, possible explanation worthy of further scientific scrutiny is something entirely different from approaching the subject of UFOs as if this discovery had already been made. Historically, it was the U.S. Air Force that, some fifty years ago, invented the term "unidentified flying object" to replace the popular but more lurid phrase "flying saucer." The Air Force defined a "UFO" as "any airborne object which by performance, aerodynamic characteristics, or unusual features does not conform to any presently known aircraft or missile type, or which cannot be positively identified as a familiar object." This is the definition embraced by all the contributors to this book, and the definition employed by all relevant government documents and official pilot reports. If an object in the sky cannot be identified but we still can't rule out the possibility that it could be if we had more data, then it is not a true unknown. In that situation, we can't determine either what it is or what it is not. Again, a genuine UFO, the UFO we are concerned with in this book, is an object that, for example, exhibits extraordinary capabilities beyond known technology while being documented on radar and observed by multiple qualified people, to such an extent that enough data is obtained and enough study is undertaken to eliminate other known possibilities. Because there is so much baggage associated with the term "UFO” some scientists and other experts have employed a new terminology to separate serious studies from the more frivolous. Instead of "UFO," some of 1 1 1 m4 14 our contributors have chosen to use "unidentified aerial phenomena" or "UAP," which can be used in both the singular (for the phenomenon) and the plural. Richard Haines, former NASA senior scientist and aviation safety expert, defines UAP as: The visual stimulus that produces a sighting report of an object or light seen in the sky, the appearance and/or flight dynamics of which do not suggest a logical, conventional flying object and which remains unidentified after close scrutiny of all available evidence by persons who are technically capable of making both a full technical identification as well as a common-sense identification, if one is possible. In the context of this book, the terms UFO and UAP mean essentially the same thing and will be used interchangeably, although some writers prefer to use one or the other exclusively. "UAP" suggests a