February 7, 2023

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Earth’s core could have reversed direction of rotation – 01/23/2023 – Science

Important EarthAccording to a study published this Monday (23), a hot sphere the size of Pluto would have reversed the direction of its rotation.

About 5,000 km from the surface, this iron “planet-within-a-planet” has stopped rotating and is now moving in the opposite direction. study Published by Nature Geoscience.

The exact mechanism of rotation of this sphere, without motion as it floats in the fluid of the outer core, is difficult to understand. They are known based on the analysis of seismic waves caused by earthquakes as they pass through the epicenter the planet.

By analyzing seismic wave data over the past six decades, Xiaodong Song and Yi Yang Peking University, He concluded that the center’s rotation “almost stopped in 2009 and then rotated in the opposite direction.”

“We believe that the central core, relative to the Earth’s surface, rotates in one direction and then the other, like a pendulum,” they told AFP.

“The complete cycle of this motion lasts for seven decades, meaning it changes direction every 35 years,” the researchers added.

The last cycle change prior to 2009 occurred in the early 1970s. And the next one will occur in the mid-2040s, completing the cycle, according to Chinese scientists.

This motion roughly adjusts for day length, minute variations in the exact time it takes for the Earth to rotate on its own axis.

To date, there are few signs of the influence of this cycle on the Earth’s surface. However, both authors guarantee that they firmly believe that there are physical connections between all the layers that make up the Earth.

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