Emily and Amy speak to Jennifer Ngo-Anh (European Space Agency), Colleen Deane (University of Exeter, UK) and Jim Pawelczyk (Penn State University, US) about the physiological challenges of space travel (and possibly living on Mars!).They also discuss: How long can a human stuck on Mars survive off potatoes? The ultimate cure for snoring, and the strange link between autonomous cars, locusts and star wars.