UFO literally means Unidentified Flying Object Or in Italian unidentified flying object . The term was first adopted by Commission of Inquiry dell'Aereonautica U.S. Military replacing the term commonly used by the people, " flying discs ". The term UFO but must immediately make a fundamental distinction: that between UFO phenomenon and UFO proper. The first simply shows all relationships collected in connection with the second, the cause dell'avvistamento. It is clear and indubitable for all, given the impressive amount of data accumulated over the years, the existence of the UFO phenomenon, but in reality is not even lawful object of the existence of UFOs. As mentioned, in fact, UFO is a term that simply indicates an unidentified flying object: it is the responsibility dell'avvistamento considered unknown in nature, nothing more.
The scholar of ufologist David Saunders In the seventies, had an estimated number of sightings around the world amounted to 50,000 However, reports are delivered only a small part of all: in fact, ordinary people tend not to give weight to certain phenomena and therefore do not report to authorities.
In general, contrary to what we tend to believe, on average, l ' reliability witnesses of a UFO phenomenon is quite high, as said Condon nell'omonima relationship "as we have seen, the person who makes the relationship seem to be in most cases quite normal and responsible." Without mention some famous sights such as Clyde Tombaugh (who discovered the planet Pluto), the astronomer Seymour Hess (scholar at the Flagstaff Observatory in Arizona, USA), Percy Wilkins (selenologo, or scholar of physics, lunar topography and morphology) and the specialist in astronautics Alexander Ananoff .
By convention the start of the real UFO phenomenon is traced back to 24 June 1947 , Because of dell'avvistamento Kenneth Arnold , Which first attracted the attention of the press and unleashed a huge series of sightings, which has already been the year before at international level the issue had significance because of the large number of sightings occurred in Scandinavia, in particular in Sweden, but it was assumed that this was experimental Russian missiles.