Deep inside Earth is a solid metal ball that rotates independently of our spinning planet, like a top whirling around inside a bigger top, shrouded in mystery.
This inner core has intrigued researchers since its discovery by Danish seismologist Inge Lehmann in 1936.
Is rotation, speed and direction — have been at the center of a decades-long debate.
A growing body of evidence suggests the core’s spin has changed dramatically in recent years, but scientists have remained divided over what exactly is happening — and what it means.
One promising model proposed in 2023 described an inner core that in the past had spun faster than Earth itself, but was now spinning slower.
Then it slowed even more, until the core was moving BACKWARD relative to the fluid layers around it.
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