The existence of extraterrestrial life has never been confirmed; therefore, no alleged alien sightings have been definitively verified as such. Many incidents of purported alien activity such as the Phoenix Lights and the O'Hare International Airport UFO sighting do, however, have numerous corroborating witnesses and/or photographic evidence.
On March 13, 1997, thousands of people in Phoenix, Arizona reported seeing a series of strange lights flying over the city, apparently behaving as one object. Multiple witnesses managed to capture photographic and video evidence of this event. As is the case with many similar sightings, the official explanation for the Phoenix Lights is widespread misidentification of the objects. Apart from sightings of unidentified flying objects, there have been many reports of extraterrestrial beings such as the Hopkinsville Goblins interacting with humans.