UFO's

UFO's (Unidentified Flying Objects) n pl : Over many centuries there have been reports of strange objects in the sky that seem to move very quickly or defy all rational explanation. The subject of UFO's is quite a contentious one. Some people believe that were are being visited by aliens in spaceships. Indeed there have been a number of conspiracy theories and ideas relating to the nature of these objects. Some of these ideas range from, alleged Government cover-ups right through to one theory about a strange species of as yet unidentified birds.