Nasa's Unexplained Files
Could there be life beyond our planet? Extraordinary NASA footage and ground-breaking interviews with astronauts and scientists investigate potential sightings of UFOs
Nasa's Unexplained Files airs on Discovery History +1 at 8:00 AM, Monday 4 August.
Topics
Education ➝ Science ➝ Factual Topics
Unexplained ➝ Mysteries