Most of the incidents investigated in Britain have been easily explained as misidentifications of stars and planets, aircraft lights, satellites and meteors, but some cases have raised national security or air safety issues.

Image Credit... Jonathon Rosen

On Dec. 26, 1980, for instance, several witnesses at two American Air Force bases in England reported seeing a U.F.O. land. An examination of the site turned up indentations in the ground and a level of radiation in the area that was significantly higher than ordinary. More witnesses at the same base reported the U.F.O. again on subsequent nights. The deputy base commander reported that the aircraft aimed light beams into the most highly sensitive area of the base  a clear security breach.

On March 30 and 31, 1993, there was a wave of U.F.O. sightings over Britain. One witness described a triangular-shaped craft that flew slowly over an air force base before accelerating away to the horizon in an instant, many times faster than a jet. The British military reported, “There would seem to be some evidence on this occasion that an unidentified object (or objects) of unknown origin was operating over the U.K.”

On April 23, 2007, a commercial airline pilot and some of his passengers reported a huge cigar-shaped U.F.O.  the pilot estimated it to be a mile wide  near the Channel Islands. At the time, air traffic controllers reported to the pilot that radar picked up something, but that it was “unknown traffic.”

In addition, there have been several incidents of near misses between U.F.O.s and known aircraft  enough to prompt the Ministry of Defense and the British Civil Aviation Authority to advise pilots, if they encounter anything, “not to maneuver, other than to place the object astern, if possible.”