According to a study published in the journal Nature Geoscience, scientists claimed that the Earth’s inner core stopped rotating in the same direction as the Earth’s and started to rotate in the opposite direction. “We believe the inner core rotates back and forth like a “swing” relative to the Earth’s surface. One cycle of the swing is about 70 years, changing direction on average every 35 years,” the researchers told AFP. said.
The research, published in the journal Nature Geoscience, included claims that the Earth’s inner core, which resembles a hot iron ball the size of Pluto, no longer rotates in the same direction as the planet, but in the opposite direction.
According to the news of Euronews, about 5 thousand km below the surface, the “planet within the planet” can rotate independently because it floats inside the liquid metal outer core.
EXPECTED TO GENERATE DISCUSSION
Since the rotation of the inner core is a matter of debate among scientists, the latest research is expected to create controversy in the scientific world. Because what is known about the inner core is quite limited.
But it is obtained by measuring small differences in seismic waves created by earthquakes or sometimes nuclear explosions as they pass through the middle of the Earth.
The research, published in the journal Nature Geoscience, analyzed seismic waves from earthquakes over the past sixty years to track the movements of the inner core.
“WE DETECTED IT WAS TURNED IN THE REVERSE DIRECTION”
The authors of the study, Xiaodong Song and Yi Yang of Peking University, stated that they found that the rotation of the inner core “nearly stopped in 2009, and then turned in the opposite direction.”
“We believe the inner core rotates back and forth like a “swing” relative to the Earth’s surface. One cycle of the swing is about 70 years, changing direction on average every 35 years,” the researchers told AFP. used the phrase.
Chinese scientists noted that the inner core changed direction in the early 1970s and they predicted the next change to occur in the mid-2040s.
The researchers reported that the rotation in question is roughly in line with small changes in the time it takes for the Earth to rotate around its axis, called “day length.”
“EVIDENCE NOT FOUND”
So far, little evidence has been found that the inner core has any effect on the surface inhabitants. However, researchers note that they believe there are physical connections between all layers of the Earth, from the inner core to the surface.
“We hope our work will encourage some researchers to build and test models that treat the entire Earth as an integrated dynamical system,” the scientists said. said.
Some experts, on the other hand, stated that they were cautious about the findings, pointed to different theories and warned that many mysteries about the center of the Earth continued.
“It’s a very careful study by scientists using a lot of data. But I don’t think any of the models explain all the data very well,” said seismologist John Vidale of the University of California. made its assessment.