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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Earth's Mysteriously Light Core Contains Brimstone

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

Why does the Earth have Layers?

Science This Week Innermost layer of Earth's core detected - The Hindu

Earth's inner core - Wikipedia

Scientists unlock secrets of Earth's wickedly hot innermost realm

Scientists Reveal Superionic Secrets of Earth's Inner Core

Earth's core is wilder than you can imagine - Environment

Earth's Outer Core - Universe Today

Ancient crystals have revealed when Earth's inner core finally formed - Interesting Engineering

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

Planet within a planet' revealed by research into Earth's deep core

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In New Study Scientists Confirm Existence Of Earth s Innermost Core - BW Businessworld