The 4th in a series of videos from the 2017 International UFO Congress. With the discovery of so many extra-solar planets (estimated at 8.8 billion in the Milky Way Galaxy alone), most astronomers and the general public have come to believe its highly likely there are other intelligent civilizations out there in the universe. Is there evidence they have already been on Earth?

Stanton Friedman is a nuclear physicist who has been studying the evidence for an extraterrestrial presence on Earth for over 40 years. He is a frequent speaker on the subject and is often tapped to debate skeptics and debunkers. Friedman has published many books on the subject, including "Flying Saucers and Science", and "Crash at Corona: The Definitive Study of the Roswell Incident." In this recent talk, Friedman takes on the academic astronomers who still dismiss the evidence for an ET presence on Earth.