Besides the many visual sightings of UFO’s there are also cases wherein there are indirect physical interactions thus producing physical evidence. These cases have been studied by the military as well as various government agencies from many different countries. Indirect physical evidences are information which was obtained from afar such as through radars, contact as well as video recordings and photographs. The more direct interactions would involve the UFO having an actual effect on the environment around it and these would include; landing traces, crop circles, electromagnetic interference as well as physiological and biological effects.

An example of UFO evidence would be the mass sightings of silent, huge and low-flying black triangular shaped objects that were tracked over Belgium by the NATO radar and jet interceptors. These objects were observed from 1989 till 1990 and were investigated by Belgium’s military. Another is the 1986 JAL case in Alaska which was investigated by the FAA.

Then there are the UFO Physiological effects on both animals and people which include temporary paralysis, skin burns and rashes, corneal burns as well as symptoms which resemble radiation poisoning. An incident showing such effects include the Cash-Landrum incident which happened in 1980 and the 1886 Venezuelan incident which was reported in the Scientific American Magazine.

But of course, there are also evidences which eventually turned out to be hoaxes such as the, Ed Walters hoax of 1987 and the George Adamski claims. UFO Evidences, every single one of them, are carefully studied by various agencies to prove its authenticity. But so far, no actual conclusion has been reached.