October 2, 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
Professor Kei Hirose has managed to recreate the extreme
temperatures and pressures found at the centre of the earth
somewhere rather more convenient to study: his own laboratory.
Professor Dan Lathrop has built a 3 meter model of the earth's core
which he plans to fill with twelve metric tons of liquid sodium, and
then spin at up to eighty-five miles an hour.