Episode 7 of the Tartan Tardigrade, a podcast where scientists from the UK Centre for Astrobiology talk to guests from around the world about their research in astrobiology, their careers, and the prospects for life in the universe. In this episode we talk to Mohit Melwani from the NASA Jet Propulsion Laboratory, who told us about the possibility for life and geochemical limits of habitability on Icy Moons (and a little bit of Mars).