UFOs - fact or fantasy?

Patrick Moore and Michael Bentine discuss UFOs - fact or fantasy? What are the unidentified flying objects which have been so much in the news in recent years? Are they spacecraft from other worlds, as some people believe, or are they optical illusions caused by weather-balloons, satellites, ice-crystals, or other aerial objects? Patrick Moore and Michael Bentine consider the question of UFOs and try to decide what these strange phenomena could be.