Earth's inner core swings about 2.35 degrees over roughly 70 years, and its gravitational pull changes the length of a day by ...

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

A hidden battle of torques 3,000 miles beneath your feet decides whether today runs long or short.

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

A study published in Nature identified the inner core as a key factor behind variations in day length that occur over several ...

Scientists have discovered a hidden force deep inside Earth that is changing the length of our days.

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

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

For practical purposes, we say that one day—the time it takes for Earth to rotate once on its axis—equates to 24 hours. In ...

(NEXSTAR) – Deep in the center of the Earth is the inner core, which spans roughly 746 miles and is composed of primarily pure, solid iron, NASA explains. Though we’ve long believed – and research has ...

A battle of forces, driven by the motion of Earth’s core, can explain small variations in the planet’s rotation, study finds.

Interactions between Earth’s solid inner core, its molten outer core and its rocky mantle control how fast the planet rotates ...