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| | unidentified flying object on Encyclopedia.com |
 | | UNIDENTIFIED FLYING OBJECT [unidentified flying object] or UFO, an object or light reportedly seen in the sky whose appearance, trajectory, and general dynamic and luminescent behavior do not readily suggest a logical, conventional explanation. |
 | | Because the objects are often shining and in that part of the sky opposite the sun, most investigators, official and unofficial alike, tend to interpret them as reflections of the sun's rays from airplanes. |
 | | Some UFOs, when pursued by planes, have proved to be weather balloons or other objects of unquestionably terrestrial origin. |
| www.encylopedia.com /html/u/unidenti.asp (501 words) |
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