DR SETH SHOSTAK / SCIENCE PHOTO LIBRARY DR SETH SHOSTAK / SCIENCE PHOTO LIBRARY
UFO. Composite image depicting an Unidentified Flying Object (UFO) travelling above the Earth's atmosphere. The UFO is a 'flying saucer' design and is trailing a column of flame from its engines. The term 'flying saucer' was coined after a 1947 sighting by a pilot, Kenneth Arnold. Most supposed 'UFO sightings' can be ascribed to mundane causes such as planets, satellites, meteorites, weather balloons, aircraft and atmospheric phenomena. Other sightings remain unexplained.
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