Our Earth's inner core (Earth's core) is the most mysterious thing on our planet and research about it often leads to surprising results.
Recent research has revealed that the Earth's inner core has slowed down and may start rotating in the opposite direction to the Earth's surface.
According to the researchers, this is not a precursor to any natural or divine signal, but it could affect the speed of the Earth's rotation. This deceleration may cause a slight difference in Earth's day and night hours and may also cause a change in Earth's gravity, but more research is needed to confirm this.
Song Zhaodong, a geophysicist at Peking University in China and one of the authors of the newly published study, says: 'We have clear evidence that the Earth's core (core) is rotating faster than the Earth's surface, but it stopped around 2009.'
This research has been published in the journal 'Nature Geoscience' this month.
The inner core of the Earth is a sphere of iron and nickel with a radius of 1,221 km. This inner part of the earth is very hot. Its temperature is 5,400 degrees Celsius which is almost equal to the 5,700 degrees Celsius of the Sun.
Surrounding this core is a thick layer of liquid metals called the outer core or outer core.
Knowing how this inner core of Earth rotates has been a topic of debate among scientists for decades.
What does the new research say?
The core of the Earth has been described as 'a planet within a planet'. Because it floats in a thick layer of liquid metals, it can circulate freely.
The core of the Earth is difficult to study completely because it is more than 5,000 km below the Earth's surface. What little we know about it comes from measuring small differences in the waves produced by earthquakes and nuclear explosions.
The authors of the new study, Song Xiaodong and Yang Yi analyzed the vibrations generated at the Earth's core by analyzing various earthquakes over the past six decades.
As he explained to the French news agency, his theory not only argues that the Earth's inner core swings from side to side like a swing, but that this happens in cycles of seven decades and Every 35 years its direction of rotation changes.'
According to their research findings, the last time its direction changed was in the early 1970s and the next change will occur in the mid-2040s.
In other words, this will not be a new phenomenon. The rotation roughly corresponds to changes in day length, the researchers say, which are small changes in the exact time it takes for the Earth to rotate on its axis.
Different opinions
So far there is not much evidence that the effects of changes in the Earth's core affect the Earth's surface, although researchers believe there are connections between all of Earth's layers.
Scientists Yang and Song say they hope their findings will "encourage researchers to build empirical models that view the Earth as an integrated dynamic system."
However, other experts are cautious about the new research and warn of many ongoing mysteries of the Earth's core, citing other theories.
A major question that still remains is how the slowness described by Yang and Song can be reconciled with the rapid changes reported in other studies.
John Waddell, a seismologist at the University of Southern California, published a study last year that suggested that the Earth's core rotates very quickly, changing its direction every six years or so.
His research was based on changes in seismic waves caused by two nuclear explosions in the 1970s.
Another study published by Australian National University geophysicist Hrovji Kalcek suggests that Earth's epicenter rotates around 20 or 30 years instead of 70.
As a result of these findings, John Waddell predicts 'more amazing' secrets about our planet's mysterious heart (core).
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