Earth's rotation experiences slight variations in day length due to interactions within its inner core and mantle.

Tiny changes in Earth’s rotation may reveal a tug-of-war between its deformable inner core, liquid outer core and deep mantle.

Scientists may have solved why the length of Earth’s day changes by a few milliseconds over decades. Subtle shifts in the ...

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Watch a video about how Earth’s inner core changes shape over time, from the University of Southern California. Earth’s inner core is less solid than we once thought Earth’s inner core lies some 3,000 ...

WASHINGTON, D.C. — Earth’s inner core, a solid metal ball gyrating within the molten outer core, may be both slowing down and changing shape. Recent analyses of earthquake waves have suggested that ...

The middle-range shifts that unfold over several decades have been harder to explain.

Earth's days are not exactly the same length. Scientists have been recording small variations in for decades. These changes are minuscule—sometimes just a few milliseconds—and mostly imperceptible, ...

The surface of the Earth's inner core may be changing, as shown by a new study by USC scientists that detected structural changes near the planet's center, published in Nature Geoscience. The changes ...

Not only is Earth's inner core spinning and growing, but it's also changing shape, according to new research. Our planet's ...

A recent study revealed that Earth’s inner core is slowing down, prompting scientists to investigate further. Their research led to an unexpected discovery: that inner core is not entirely solid.

Scientists recently discovered that Earth’s inner core reversed the direction in which it spins. Now, they’re discovering Earth’s inner core is changing shape, twisting, and deforming, in ways ...