BBC 地平线系列: 地心 BBC Horizon: The Core/2011

For centuries we have dreamt of reaching the centre of the Earth. Now scientists are uncovering a bizarre and alien world that lies 4，000 miles beneath our feet， unlike anything we know on the surface. It is a planet buried within the planet we know， where storms rage within a sea of white-hot metal and a giant forest of crystals make up a metal core the size of the Moon.

Horizon follows scientists who are conducting experiments to recreate this core within their own laboratories， with surprising results.

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