If we are to create a colony on the Moon – perhaps as a jumping off point for the human exploration of Mars – we will need a source of water. In this episode of the Physics World Weekly podcast, planetary scientist Hannah Sargeant of the Open University explains how water could be obtained on the Moon and what it would be used for.

This week we also talk about how radiotherapy could be used to treat COVID-19 and why a gear-changing collider could be a boon to nuclear physicists.