The Earth's Core
In Our Time30 Huhti 2015

The Earth's Core

Melvyn Bragg and his guests discuss the Earth's Core. The inner core is an extremely dense, solid ball of iron and nickel, the size of the Moon, while the outer core is a flowing liquid, the size of Mars. Thanks to the magnetic fields produced within the core, life on Earth is possible. The magnetosphere protects the Earth from much of the Sun's radiation and the flow of particles which would otherwise strip away the atmosphere. The precise structure of the core and its properties have been fascinating scientists from the Renaissance. Recent seismographs show the picture is even more complex than we might have imagined, with suggestions that the core is spinning at a different speed and on a different axis from the surface.

With

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

Producer: Simon Tillotson.

Jaksot(1077)

The Habitability of Planets

The Habitability of Planets

Melvyn Bragg and guests discuss some of the great unanswered questions in science: how and where did life on Earth begin, what did it need to thrive and could it be found elsewhere? Charles Darwin spe...

9 Tammi 202552min

Nizami Ganjavi

Nizami Ganjavi

Melvyn Bragg and guests discuss one of the greatest romantic poets in Persian literature. Nizami Ganjavi (c1141–1209) is was born in the city of Ganja in what is now Azerbaijan and his popularity soo...

2 Tammi 202552min

The Hanoverian Succession

The Hanoverian Succession

Melvyn Bragg and guests discuss the intense political activity at the turn of the 18th Century, when many politicians in London went to great lengths to find a Protestant successor to the throne of Gr...

26 Joulu 202450min

Italo Calvino

Italo Calvino

Melvyn Bragg and guests discuss the Italian author of Invisible Cities, If On A Winter's Night A Traveller, Cosmicomics and other celebrated novels, fables and short stories of the 20th Century. Calvi...

19 Joulu 202448min

The Antikythera Mechanism

The Antikythera Mechanism

Melvyn Bragg and guests discuss the 2000-year-old device which transformed our understanding of astronomy in ancient Greece. In 1900 a group of sponge divers found the wreck of a ship off the coast o...

12 Joulu 202450min

George Herbert

George Herbert

Melvyn Bragg and guests discuss the poet George Herbert (1593-1633) who, according to the French philosopher Simone Weil, wrote ‘the most beautiful poem in the world’. Herbert gave his poems on his r...

5 Joulu 202452min

The Venetian Empire

The Venetian Empire

Melvyn Bragg and guests discuss the remarkable rise of Venice in the eastern Mediterranean. Unlike other Italian cities of the early medieval period, Venice had not been settled during the Roman Empir...

28 Marras 202451min

Little Women

Little Women

Melvyn Bragg and guests discuss Louisa May Alcott's 1868 novel, credited with starting the new genre of young adult fiction. When Alcott (1832-88) wrote Little Women, she only did so as her publisher ...

21 Marras 202448min

Suosittua kategoriassa Historia

olipa-kerran-otsikko
gogin-ja-janin-maailmanhistoria
mayday-fi
huijarit
mystista
tsunami
totuus-vai-salaliitto
rss-ikiuni
konginkangas
rouva-diktaattori
rss-subjektiivinen-todistaja
sotaa-ja-historiaa-podi
rss-i-dont-like-mondays-2
rss-peter-peter
tiedetta-ja-sirkushuveja-vanhojen-aikojen-podcast
maailmanpuu
rss-kirkon-ihmeellisimmat-tarinat
rss-iltanuotiolla
rss-kalmakabinetti
rss-sattuu-sita-suomessakin