First
A sighting of one or more unidentified flying objects:
- Flying saucers
- Odd lights
- Aerial objects that are not attributable to known human technology
Second
An observation of a UFO, and associated physical effects from the UFO, including:
Third
An observation of what Hynek termed "animate beings" observed in association with a UFO sighting.
[6] Hynek deliberately chose the somewhat vague term "animate beings" to describe beings associated with UFOs without making any unfounded assumptions regarding the beings' origins or nature. Hynek did not necessarily regard these beings as "
extraterrestrials" or "aliens." Additionally, Hynek further expressed discomfort with such reports, but felt a scientific obligation to include them, at the very least because they represented a sizable minority of claimed UFO encounters.
s that are not attributable to known human technology