Have we been visited by space aliens? This month space boffins Sue Nelson and Richard Hollingham delve into the history and science of Unidentified Flying Objects (UFOs). They discuss UFOs with Pennsylvania State College professor and author of After the Flying Saucers Came, Greg Eghigian. They also talk to Thomas Zurbuchen, the longest ever serving head of science at NASA who commissioned an official report on UFOs. What does he believe? Like this podcast? Please help us by supporting the Naked Scientists