1. UFOs are strange 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 balloon 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 north of Mount Rainier.
In 1952, there were more than 1,500 UFO sightings around the world.
In 1954, a woman and her children believed they saw a UFO above their house. The woman said she saw two in the spacecraft.
In 1964, a farmer claimed he saw an egg-shaped object in one of his fields and also aliens collecting soil samples.
In 1971, two men claimed they were by aliens and taken aboard a spacecraft. After being examined by the aliens, the men were freed.
In 1978, a young pilot and his plane disappeared after sighting a UFO.
In 1981, Renato Nicolai, who was living in the south east of France, reported that he saw a plate-like device at a 30 meters away from his garden.