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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.