In Our Time

BBC Radio 4

Society & Culture, History

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History 12
Society & Culture 68

Melvyn Bragg and guests discuss the history of ideas


IOT: The Earth's Core 30 Apr 15

April 30th, 2015

Episode 455 of 552 episodes

The Earth's inner core is an extremely dense, solid ball of iron and nickel, while the outer core is a flowing liquid. Life on Earth is possible thanks to the magnetic fields produced by the core which protect the Earth from dangerous cosmic rays from space. The precise structure of the core and its properties have fascinated scientists since the Renaissance. Recent research shows the picture is even more complex than we might have imagined, with suggestions that the core is spinning at a different speed from the surface. Melvyn Bragg is joined by Stephen Blundell, Professor of Physics and Fellow of Mansfield College at the University of Oxford; Arwen Deuss, Associate Professor in Seismology at Utrecht University and Simon Redfern, Professor of Mineral Physics at the University of Cambridge.

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