Determining if a UFO is terrestrial or extra-terrestrial - Look for glowing lights around Extra-terrestrial UFOs, which manifest the subdued high intensity electromagnetic flux Are all UFOs Extra-terrestrial? No, they are not. Many of the sightings are illusions and also are unknown experimental terrestrial aircrafts. But how do you distinguish between an extra-terrestrial UFO and a terrestrial UFO. According to some researchers there is a way to distinguish between terrestrial and extra-terrestrial UFOs. Most UFOs are associated with some lights. According to these researchers, if you can see the light in the aircraft, it is a terrestrial UFO. Extra-terrestrial UFOs...