Inner Core

The Earth's inner core is the Earth's innermost part. It is primarily a solid ball with a radius of about, which is about 70% of the Moon's radius. It is composed of an iron–nickel alloy and some other elements. The temperature at the inner core's surface is approximately, which is about the temperature at the surface of the Sun.

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Earth's inner core may be slowing down, but “Nothing cataclysmic is happening,” says Hrvoje Tkalcic, a geophysicist at Australian National University. “The inner core is now more in sync with the rest of the planet than a decade ago when it was spinning a bit faster.”

Earth's inner core may be slowing down compared to the rest of the planet

No, Earth’s Inner Core Is Not Reversing The Direction Of Its Spin

Why Earth's Inner Core May Be Slowing Down

Study: Changes in Rotation of Earth’s Inner Core Occur on Decadal Scale

Earth's inner core may have started spinning other way

Earth's Inner Core May Have Started Rotating in the Opposite Direction

Earth's Inner Core May Right Now Be in The Process of Changing Direction

Earth’s Inner Core Paused, Then Reversed Its Spin. This Is Fine.

Earth’s inner core may be reversing its rotation

New Research Shows Earth’s Inner Core May Be Oxygen-Rich

Astronomers spot exposed inner core of an 'oddball' star by accident | Space

Astronomers spot the exposed inner core of an 'oddball' star by accident

New paleomagnetic research suggests Earth’s solid inner core formed 550 million years ago and restored our planet’s magnetic field, just before the explosion of multicellular life on Earth, and avoiding a Mars-like fate

Magnetism in Ancient Crystals Reveals When Earth's Inner Core Emerged

Earth’s Wobbly Inner Core Illuminated by Nuclear Explosions

Earth’s Inner Core Not Just Rotates, but Oscillates Too: Study