UFO

A UFO, unidentified flying object, is any object flying in the sky which cannot be identified by the person who sees it. Sometimes, the object is investigated. If people can still not figure out what the project is after an investigation, it's called a UFO. If they figure out what the object is, it can no longer be called a UFO because it has been identified. Even though UFOs can be anything, people often use the word UFO, when they're talking about alien spacecraft. Flying saucer is another word that is often used to describe an unidentified flying object. Studies estimate that fifty to ninety percent of all reported UFO sightings are identified later; usually 10 to 20 percent are never identified. Studies also show that very few UFO sightings are hoaxes: people trying to trick other people. Most IFOs are actually natural or man-made objects that look strange. 80 to 90 percent of IFOs are identified as one of three different things: astronomical causes, for example, planets, stars, or meteors, aircraft, balloons, including weather balloons; 10 to 20 percent of IFOs are other causes, such as birds, clouds, mirages searchlights etc.