Get the full timeline here: http://alien-ufo-research.com/history-of-ufo-sightings-timeline/ Throughout the beginning of man kind people have been been seeing strange things in the sky. Some people even think that they may be visitors from other worlds. In this day in age people are still researching the hundreds of sightings every year, but still there is no consensus as to what all of them are. While Governments around the world will have you think that they are all just weather balloons or swamp gas not all of them can be explained. Here is a timeline of important UFO sightings and abduction cases that are still unknown and a link to a large timeline of all important UFO and alien cases. Do you believe that there is life out there visiting Earth?