Scientists Detect Unexpected Shift in Earth’s Core

Deep beneath our feet, the Earth's inner core is doing something unexpected.

Scientists have discovered that this solid iron-nickel sphere, roughly the size of the Moon, has undergone a measurable shift in its rotation.

For years, experts believed the core rotated faster than the planet’s surface—a phenomenon called super-rotation.

However, new seismic data suggests that around 2009, the core’s rotation slowed down, currently appearing to move in reverse relative to the mantle.

Researchers believe this is not a permanent change but part of a 70-year cycle where the core speeds up and slows down.

Scientists use 'seismic sonar'—analyzing waves from repeating earthquakes—to study these deep movements.

This behavior is driven by magnetic and gravitational forces between the inner core, the liquid outer core, and the rocky mantle.

While the idea of a shifting core might sound dramatic, it is a natural process.

The impact on our daily lives is negligible, causing only tiny, nearly invisible changes to the length of a day.