Brian Cox and Robin Ince find out about dust that is raining down on Earth from space. They are joined by planetary scientists Matthew Genge and Penny Wozniakiewicz and comedian Alan Davies. They learn how billions of tiny micrometeorites land on the surface of the Earth every year, hidden amongst pollution particles and household dust. Where does cosmic dust come from and what can it tell us about the birth of the solar system?New episodes are released on Saturdays. If you're in the UK, listen to the full series first on BBC Sounds: bbc.in/3K3JzyFProducer: Caroline Steel Executive Producer: Alexandra Feachem