Scientists discover core deep inside Earth — a solid ball of iron and nickel

Researchers on Tuesday said an intensive study of Earth’s deep interior confirmed the existence of a distinct structure inside our planet’s inner core.
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Science This Week Innermost layer of Earth's core detected - The Hindu

Geothermal Energy Turns Planets Into Power Sources

Earth's inner core may have stopped turning and could go into reverse, study suggests

Scientists Discovered a Mystery Layer in Earth's Core / Bright Side

Scientists discover massive solid metal ball inside Earth's core

How do scientists know that there are three layers in the Earth's interior: inner core, outer core and mantle? - Quora

Geothermal Energy Turns Planets Into Power Sources

Researchers discover massive solid metal ball inside Earth

Structure of the Earth

Earth has an 'innermost inner core', study says

Scientists measured density of liquid iron under conditions similar to those at Earth's outer core