Project Condign was a secret unidentified flying object (UFO) study undertaken by the British Government's Defence Intelligence Staff (DIS) between 1997 and 2000.
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Unidentified flying object
An unidentified flying object (UFO), or unidentified anomalous phenomenon (UAP), is any perceived airborne, submerged or transmedium phenomenon that cannot be immediately identified or explained. Upon investigation, most UAPs are identified as known objects or atmospheric phenomena, while a small number remain unexplained.
The celestial phenomenon over Basel in 1566.
1561 celestial phenomenon over Nuremberg as printed in an illustrated news notice.
November 22, 1896 illustration of a "mystery airship" published in The San Francisco Call
November 29, 1896 illustration of another "mystery airship" published in The San Francisco Call