Science: Saucer Diehards

For two decades, the U.S. Air Force kept tab on unidentified flying objects in a project called Blue Book. Then, in 1969, the number of UFOs reported in U.S. skies sharply dwindled, and the Blue Book was closed. Why did the UFOs suddenly become scarce?

Saucer skeptics have a number of theories. For one thing, an intensive Air Force-sponsored study of UFO "sightings," conducted under the supervision of University of Colorado Physicist Edward U. Condon, was issued in 1969.

It provided plausible explanations for almost all the reports; they were apparently based on optical illusions, stars, weather inversions and even satellites. Furthermore, man's...

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