ForcenturieswehavedreamtofreachingthecentreoftheEarth.Nowscientistsareuncoveringabizarreandalienworldthatlies4,000milesbeneathourfeet,unlikeanythingweknowonthesurface.Itisaplanetburiedwithintheplanetweknow,wherestormsragewithinaseaofwhite-hotmetalandagiantforestofcrystalsmakeupametalcorethesizeoftheMoon.　　Horiz..ddd