According to Sci-News, the movement of our planet's inner core has been debated by the scientific community for three decades, with some studies indicating that the Earth's inner core rotates faster than the planet's surface.

A new study, led by Professor John Vidale of the University of Southern California (USA), has pointed out drastic changes since around 2010 that Earthlings have never known about.

A paper published in the scientific journal Nature confirms that the Earth's core has slowed down. Now the core rotates even slower than the outer parts.

“When I first saw the seismic records showing this change, I was puzzled. But when we found more than 20 other observations signaling the same pattern, the result was inevitable,” said Professor Vidale.

This is the first time the Earth's core has slowed down in 40 years, even rotating in the opposite direction to the planet's surface.

This core is a solid iron-nickel sphere surrounded by a liquid iron-nickel outer core, roughly the size of the Moon and located more than 3,000 miles below our feet.

In the study, they compiled and analyzed seismic data recorded around the South Sandwich Islands from 121 recurring earthquakes that occurred between 1991 and 2023.

They also used data from the Soviet Union's twin nuclear tests from 1971-1974, which caused seismic-like tremors, as well as repeated nuclear tests by France and the United States.

All show one result.

Scientists have yet to fully assess the changes to the Earth's surface related to the "unusual behavior" of the planet's core.

You can tell by the fact that the length of a day has changed. But you don't need to adjust your watch. The changes only shorten the day by about a thousandth of a second.

Scientists remain skeptical about other potential changes that have affected the planet since the core slowed down.

They plan to delve deeper into this research, which will not only help predict what will happen in the future, but also help gain a deeper understanding of the planet's history.