While most of us take the ground beneath our feet for granted, written within its complex layers ... In fact, Earth's inner core appears to have another even more inner core within it.

Buried more than 3,000 miles beneath our feet, Earth’s solid inner core was once thought to be unchanging—locked in place at ...

the researchers note that understanding the Earth’s inner core is difficult for several reasons. Chief among these is the fact that seismological observations have shown a complicated structure ...

Although this inner core is white hot, the pressure is so high the iron cannot melt. The iron isn't pure—scientists believe it contains sulfur and nickel, plus smaller amounts of other elements.

Physicists suggest a new explanation for the interesting properties of the Earth's inner core ... the underlying metallic structure of the iron and making the core more malleable.

The Earth has a layered structure made ... heat energy from the hot core. The outer core is liquid iron and nickel and generates the Earth's magnetic field. And the inner core is made of solid ...

Scientists have confirmed that the Moon has a solid inner core with a density similar to iron. The core's structure mirrors that of Earth's, with a fluid outer layer and solid inner core ...