UFO'S

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UFOs are unidentified flying objects, but no one really knows what they are. Many researchers (called "ufologists") have theories about what UFOs might be, but because no one can examine a UFO in a scientific laboratory, all of these ideas are really only educated guesses. We can offer a definition of UFOs, however, that you may find useful when you study the subject: 

A UFO is the reported sighting of an object or light seen in the sky or on land, whose appearance, trajectory, actions, motions, lights, and colors do not have a logical, conventional, or natural explanation, and which cannot be explained, not only by the original witness, but by scientists or technical experts who try to make a common sense identification after examining the evidence.