The Earth's inner core—a hot iron ball the size of Pluto—has stopped rotating at the same time
The Earth's core is about 5,000 km belowsurface of the Earth. This Pluto-sized object can rotate independently of the planet. In fact, it “free floats” in an outer core of liquid metal. Scientists still don’t know exactly how the inner core rotates. Many studies are considered controversial.
In a new study, scientists tracked the movement of the Earth's inner core by analyzing seismic waves from repeated earthquakes over the past six decades.
Experts have concluded that it is rotatingrelative to the surface of the Earth forward and backward, “like a swing.” Moreover, one cycle of fluctuation is about seven decades, that is, it changes direction approximately every 35 years.
According to preliminary estimates, the next “reversal” will occur in the mid-2040s.
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