Izzie Clarke and Dr Becky Smethurst explore the importance of Earth's core and magnetic field. Plus, the team finds out about the astronomer who sailed the seas in the name of science and Robert Massey joins to chat about all things stargazing.

With special thanks to Dr Rebekah Higgitt from National Museums Scotland. You can see the National Maritime Museum's collections of Halley's charts here: https://collections.rmg.co.uk/collections/objects/540213.html

The Supermassive Podcast is a Boffin Media Production by Izzie Clarke and Richard Hollingham