UFO or U.F.O., is the abbrevation of unidentified flying object. UFO is is an unusual apparent anomaly in the sky that is not readily identifiable to the observer as any known object.
Always people was see objects objects in the sky believe that is an UFO, But many of them are due to comets, bright meteors, one or more of the five planets that can be seen with the naked eye, planetary conjunctions, or atmospheric optical phenomena such as parhelia and lenticular clouds.
So that this topic has been studied for differents scientist but even at this moment is a mistery, and question to thousand a persons. so each person believes what they want.
