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1. UFOs are   flying objects that some people report they have seen in the sky and believed to be   from another planet. Many scientists do not believe so. They say that if people see a UFO, it might be an aircraft, a weather   or a meteor. However, there is still evidence for people to believe in the existence of UFOs.
In 1947, Kenneth Arnold, an experienced   in the USA, reported that he saw nine large round objects traveling at about 2,800 meters an hour to the left and   of Mount Rainier.
In 1952, there were more than 1,500 UFO sightings around the world.