At least 90% of UFO sightings can be identified as conventional objects, although time-consuming investigations are necessary for such identification. The objects most often mistaken for UFOs are bright planets and stars, peculiar clouds, birds, aircraft, balloons, kites, aerial flares, meteors and satellites. Between 1647 to 1969 at total of 12,618 reports have been received concerning unidentified flying objects, of which 701 of the reports, or 5.6 percent, were listed as unexplained.

There are three types of sightings. First comes the Close Encounter of the First Kind. In this setting, a UFO is seen at close range, but does not interact with its environment. This type is the most common.

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