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Description
* Other atmospheric objects and phenomena (birds, unusual clouds, kites, flares)
* Light phenomena (mirages, Fata Morgana, moon dogs, searchlights and other ground lights, etc.)
* Hoaxes

A study by the Battelle Memorial Institute of US Air Force reports included these categories as well as a "psychological" one. However, the scientific analysts were unable to come up with prosaic explanations for 21.5% of the 3200 cases they examined and 33% of what were considered the best cases remained unexplained, double the number of the worst cases. (See full statistical breakdown in Identification studies of Pe-eFos). Of the 69% identifieds, 38% were deemed definitely explained while 31% were thought to be "questionable." About 9% of the cases were considered to have insufficient information to make a determination.

Description
* Other atmospheric objects and phenomena (birds, unusual clouds, kites, flares)
* Light phenomena (mirages, Fata Morgana, moon dogs, searchlights and other ground lights, etc.)
* Hoaxes

A study by the Battelle Memorial Institute of US Air Force reports included these categories as well as a "psychological" one. However, the scientific analysts were unable to come up with prosaic explanations for 21.5% of the 3200 cases they examined and 33% of what were considered the best cases remained unexplained, double the number of the worst cases. (See full statistical breakdown in Identification studies of Pe-eFos). Of the 69% identifieds, 38% were deemed definitely explained while 31% were thought to be "questionable." About 9% of the cases were considered to have insufficient information to make a determination.