A new study reveals that Earth's inner core is rotating slower than the rest of the planet. Scientists suggest this shift could impact Earth's magnetic field and even alter the length of our days. What does this mean for our planet’s future?

What if the earth stopped spinning? Unprecedented changes in Earth’s inner core

Chinese scientists have found that Earth's inner core wobbles around its rotational axis every 8.5 years. According to a study published in Nature Communications journal, a tiny misalignment between the inner core and the Earth's mantle, the layer below the crust, causes this movement.

Chinese scientists have found that Earth's inner core wobbles around its rotational axis every 8.5 years. According to a study published in Nature Communications journal, a tiny misalignment between the inner core and the Earth's mantle, the layer below the crust, causes this movement. Earth's core has two parts: a swirling liquid outer boundary and an almost solid inner layer. This region, starting 2,896 kilometres beneath the surface, is accountable for numerous geophysical dynamics of our planet, including the length of each day and Earth's magnetic field that protects humans from the Sun's harmful rays. The study noted that this shift can eventually alter the motion or shape of the liquid core, causing a change in the Earth's magnetic field. In 2019, Hao Ding of Wuhan University and his team of geophysical researchers examined the motion of Earth's rotational axis relative to its crust, also called polar rotation. They noticed a subtle deviation in polar rotation, which occurs every 8.5 years, leading to the discovery of "inner core wobble." To simplify things, the researchers have described the shift in Earth's inner core as similar to the wobble of a spinning top. ALSO READ | Spectacular! Japan's XRISM satellite provides first glimpse into X-ray cosmos Furthermore, Ding and his co-authors verified this cycle by measuring slight shifts in day length worldwide, controlled by the periodic movement of the Earth's rotational axis. They compared it to the deviations in polar motion. The researchers concluded that a tilt of 0.17 degrees between Earth's inner core and mantle causes this wobble. It rules out the traditional Earth rotation theory that "assumes that the rotation axis of the Earth's inner core and the rotation axis of the mantle coincide," Ding told Live Science. The research also suggests that the tilt implies that the inner core northern hemisphere might be a little denser than the rest of the layers, as there is a contrast between Earth's inner and outer core density. John Vale, a professor of Earth Science at the University of Southern California, told Live Science, "The new study helps discern the difference in composition between the metal in the solid inner and liquid outer core as well as estimates direction and speed of the wobble of the inner core." The research team did not consider atmospheric, oceanic, and hydrological influences that might have influenced the deviation in polar motion besides the inner core wobble. However, it's a crucial discovery as it could help researchers in the future comprehend the dynamics between Earth's inner core and natural events that impact humanity, like earthquakes. (With inputs from agencies)

Scientists might finally know why Earth's inner core wobbles every 8.5 years

Earth's inner core&nbsp;has always had a pace of its own. Surprisingly, scientists have known about the unusual behaviour since the mid-1990s. However, a recent study revealed that Earth's inner core has stopped spinning and might change its original direction of motion. A study published in Nature Geoscience stated that the internal core rotation of our planet recently paused after geoscientists analysed the motion pattern. In 2009, the movement stopped suddenly and started moving in the opposite direction. Earth's inner core moves in relative motion with the speed of Earth like a swing, and one cycle of the swing is about seven decades, geoscientists told AFP. Previously, it switched paths in the early 1970s. According to the prediction by researchers from China's Peking University, the successive motion would be in the 2040s.&nbsp;

Our planet earth consists of three layers, crust, core and mantle. The Earth's core again divides into two, the inner and outer. Let's look deeper into the Earth's inner core to understand what's happening.

<h2>What is Earth's inner core?</h2>

In 1936, scientists discovered it while analysing the waves that travel through the planet during an earthquake. About 7,000 kilometres wide, it is made up of a shell of liquid iron wrapping a solid centre of the iron.&nbsp;

A study in 1996 revealed that the travelling speed of seismic waves through the Earth's inner core demonstrated a periodic variation over the last three decades. The rotation rate grew faster by 1 degree per year than the mantle and crust.&nbsp;

<h2>What will happen due to directional change in Earth's inner core?</h2>

According to the researchers, the core's rotation directly connects to a day's length, Earth's rotation, and Earth's mantle and crust. They have also cited evidence of gravitational coupling that led to dynamic interactions between all three layers of Earth. However, no evidence shows that the directional change in Earth's inner core has affected the routine lives of people.&nbsp;

ALSO READ |&nbsp;<a href="www.wionews.com/entertainment/lifestyle/news-wait-what--sea-spiders-can-regrow-not-just-limbs-but-these-amputated-body-parts-too-555434">Wait, what? Sea spiders can regrow not just limbs, but these amputated body parts too</a>

Earth's inner core has always had a pace of its own. Surprisingly, scientists have known about the unusual behaviour since the mid-1990s. However, a recent study revealed that Earth's inner core has stopped spinning and might change its original direction of motion.

Earth's inner core has always had a pace of its own. Surprisingly, scientists have known about the unusual behaviour since the mid-1990s. However, a recent study revealed that Earth's inner core has stopped spinning and might change its original direction of motion. A study published in Nature Geoscience stated that the internal core rotation of our planet recently paused after geoscientists analysed the motion pattern. In 2009, the movement stopped suddenly and started moving in the opposite direction. Earth's inner core moves in relative motion with the speed of Earth like a swing, and one cycle of the swing is about seven decades, geoscientists told AFP. Previously, it switched paths in the early 1970s. According to the prediction by researchers from China's Peking University, the successive motion would be in the 2040s. Our planet earth consists of three layers, crust, core and mantle. The Earth's core again divides into two, the inner and outer. Let's look deeper into the Earth's inner core to understand what's happening. What is Earth's inner core? In 1936, scientists discovered it while analysing the waves that travel through the planet during an earthquake. About 7,000 kilometres wide, it is made up of a shell of liquid iron wrapping a solid centre of the iron. A study in 1996 revealed that the travelling speed of seismic waves through the Earth's inner core demonstrated a periodic variation over the last three decades. The rotation rate grew faster by 1 degree per year than the mantle and crust. What will happen due to directional change in Earth's inner core? According to the researchers, the core's rotation directly connects to a day's length, Earth's rotation, and Earth's mantle and crust. They have also cited evidence of gravitational coupling that led to dynamic interactions between all three layers of Earth. However, no evidence shows that the directional change in Earth's inner core has affected the routine lives of people. ALSO READ | Wait, what? Sea spiders can regrow not just limbs, but these amputated body parts too

Earth's inner core might have stopped and changed direction: Check out what happens now!

Our universe is extremely complex, and there is perhaps a lot we might never be able to grasp. But understanding our own planet - the Earth is a good place to start! And while scientists recently attempted to pursue this goal, they were shocked to see that our planet has another layer locked deep inside its core.

What we usually call our “inner core” is usually perceived as the centre of our planet, and its innermost layer. But turns out, the inner core has an inner core of its own!

A challenge to traditional understanding

The traditional understanding of Earth puts forward four layers - the crust, the mantle, the outer core, and the inner core. Each layer represents the history of our planet’s creation and evolution.

Also read:&nbsp;<a href="https://www.wionews.com/science/scientists-discover-oldest-volcanic-rock-to-exist-on-earth-369109" hreflang="en">Scientists discover oldest volcanic rock to exist on Earth</a>

Most knowledge about the planet’s insides comes from what volcanoes around the globe have spewed out over the years, along with directions of seismic waves. Scientists believe with a temperature running upto 5,000 degrees Celsius (9,000 Fahrenheit), the inner core represents only a per cent of the planet’s volume.

Now, researchers think there are two layers within the inner core, something researchers believe would “rewrite textbooks”.&nbsp; The research was undertaken by a team from the Australian National University.

How did they do it?

Based on gatherings from the International Seismological Centre, the team used algorithms to go through various models of our planet’s inner core - taking into account data about how long seismic waves take to travel through the planet.&nbsp;

Also read:&nbsp;<a href="https://www.wionews.com/science/scientists-just-spotted-most-distant-radio-blast-to-ever-reach-earth-369043" hreflang="en">Scientists just spotted most distant radio blast to ever reach Earth!</a>

Then, the scientists conducted an anisotropy, which essentially tracked how differences in core’s material changed the properties of seismic waves. They found that the depth of the inner core did not throw up many variations, but there was a change 54 degree angle change.&nbsp;

"We found evidence that may indicate a change in the structure of iron, which suggests perhaps two separate cooling events in Earth's history," Joanne Stephenson, the lead author of the study said told the University.

Our universe is extremely complex, and there is perhaps a lot we might never be able to grasp. But understanding our own planet - the Earth is a good place to start!

Our universe is extremely complex, and there is perhaps a lot we might never be able to grasp. But understanding our own planet - the Earth is a good place to start! And while scientists recently attempted to pursue this goal, they were shocked to see that our planet has another layer locked deep inside its core. What we usually call our “inner core” is usually perceived as the centre of our planet, and its innermost layer. But turns out, the inner core has an inner core of its own! A challenge to traditional understanding The traditional understanding of Earth puts forward four layers - the crust, the mantle, the outer core, and the inner core. Each layer represents the history of our planet’s creation and evolution. Also read: Scientists discover oldest volcanic rock to exist on Earth Most knowledge about the planet’s insides comes from what volcanoes around the globe have spewed out over the years, along with directions of seismic waves. Scientists believe with a temperature running upto 5,000 degrees Celsius (9,000 Fahrenheit), the inner core represents only a per cent of the planet’s volume. Now, researchers think there are two layers within the inner core, something researchers believe would “rewrite textbooks”. The research was undertaken by a team from the Australian National University. How did they do it? Based on gatherings from the International Seismological Centre, the team used algorithms to go through various models of our planet’s inner core - taking into account data about how long seismic waves take to travel through the planet. Also read: Scientists just spotted most distant radio blast to ever reach Earth! Then, the scientists conducted an anisotropy, which essentially tracked how differences in core’s material changed the properties of seismic waves. They found that the depth of the inner core did not throw up many variations, but there was a change 54 degree angle change. "We found evidence that may indicate a change in the structure of iron, which suggests perhaps two separate cooling events in Earth's history," Joanne Stephenson, the lead author of the study said told the University.

Our planet Earth may have not one, but two inner cores!

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What if the earth stopped spinning? Unprecedented changes in Earth’s inner core

Scientists might finally know why Earth's inner core wobbles every 8.5 years

Earth's inner core might have stopped and changed direction: Check out what happens now!

Our planet Earth may have not one, but two inner cores!