Let's get familiar with UFOs!
The term UFO (Unidentified Flying Object) came about in the 1950s. Earlier, in 1947, the public began referring to unusual objects in the sky as flying saucers. And today, UAP (Unidentified Aerial Phenomena) is the preferred term used by the U.S. Government. OVNI (Objeto Voador Não Identificado) is another popular reference to these types of objects, used in Spanish speaking regions around the world.
Thousands of UFOs are reported each year. In North America, most reports are made through MUFON and the National UFO Reporting Center (U.S. organizations). GEIPAN, a unit of the French Space Agency CNES, collects and reports UFO data as well. Around the world, many UFO enthusiasts and groups are attempting to track UFO on their own.
What are these things?!
That's the question people have been asking for decades. Most UFOs are unremarkable and can be easily explained, but some reports of unidentifed flying objects are difficult to comprehend given our current understanding of science and technology.
Skeptics suggest that the more unusual sightings are of experimental craft, or top secret projects that the public hasn't been made aware of yet. Many UFO researchers, on the other hand, argue that these sorts of explanations can't account for everything.