Earth’s inner core seems to be slowing its spin

This isn’t the beginning of the end times. Instead the findings stoke debate about how the core influences some of the most fundamental parts of our planet.

Don’t panic. The core’s slowing down isn’t the beginning of the end times. The same thing appears to have happened in the late 1960s and early 1970s, and the study authors at Peking University in China suggest it may represent a 70-year cycle of the core’s spin speeding up and slowing down.

But while other experts praised the rigor of the analysis, the study will sharpen, not settle, the fierce scientific debate about what the mysterious metal sphere at the center of the Earth is up to.

“It’s only contentious because we can’t figure it out,” said John Vidale, a geophysicist at the University of Southern California. “It’s probably benign, but we don’t want to have things we don’t understand deep in the Earth.”

By analysing earthquake seismic waves that have passed through the inner core, researchers were able to calculate how the spin of the inner core has changed since the 1960s. They found that seismic waves have tended to follow a very similar path since about 2009, suggesting that the inner core rotation has paused.

The Earth's core may have stopped spinning, or may even now be spinning backwards, according to a new study. The core of our planet is made up of an outer layer of liquid metal, and an inner core of solid metal that is about 70 per cent the size of the Moon


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