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For the inner core to rotate despite gravitational coupling, it must be able to change shape, which places constraints on its viscosity. A 2023 study reported that the spin of the Earth's inner core has stopped spinning faster than the planet's surface around 2009 and likely is now rotating slower than it. [1]
Earth’s inner core, a red-hot ball of iron 1,800 miles below our feet, stopped spinning recently, and it may now be reversing directions, according to an analysis of seismic activity.
A USC professor has confirmed what many scientists already believed: Rotation of the solid iron ball at Earth's center is slowing. The spinning of Earth's inner core is slowing down. Is this how ...
Here’s what it could mean — and why the topic has been the subject of fierce debate. Earth’s core has slowed so much it’s moving backward, scientists confirm. Here’s what it could mean
Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 20% of Earth's radius or 70% of the Moon's radius. [1] [2] There are no samples of the core accessible for direct measurement, as there are for Earth's mantle. [3]
A geophysical study reports that the spin of the Earth's inner core has stopped spinning faster than the planet's surface and likely is now rotating slower than it. This is not thought to have major effects and one cycle of the oscillation is about seven decades, coinciding with several other geophysical periodicities .
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Estimates of the Earth's rotation 500 million years ago are around 20 modern hours per "day". The Earth's rate of rotation is slowing down mainly because of tidal interactions with the Moon and the Sun. Since the solid parts of the Earth are ductile, the Earth's equatorial bulge has been decreasing in step with the decrease in the rate of rotation.