A study suggests the Earth’s inner core, which rotates independently from Earth’s surface, slowed down — but it didn’t stop or reverse direction.

The Earth's inner core changes its rotation relative to the rest of the planet. Scientists see this as confirmation of a roughly 70-year oscillation.

Behind the expedition to the Earth's mantle 04:06. Earth's inner core, a hot iron ball the size of Pluto, has stopped spinning in the same direction as the rest of the planet and might even be ...

Seismologists noted in the 1880s that S waves generated by earthquakes didn’t pass all the way through Earth, and so they concluded that Earth’s core was molten.

A study suggests the Earth’s inner core, which rotates independently from Earth’s surface, slowed down — but it didn’t stop or reverse direction.

A study suggests the Earth’s inner core, which rotates independently from Earth’s surface, slowed down — but it didn’t stop or reverse direction.

A study suggests the Earth’s inner core, which rotates independently from Earth’s surface, slowed down — but it didn’t stop or reverse direction.

A study suggests the Earth’s inner core, which rotates independently from Earth’s surface, slowed down — but it didn’t stop or reverse direction.

A study suggests the Earth’s inner core, which rotates independently from Earth’s surface, slowed down — but it didn’t stop or reverse direction.

A study suggests the Earth’s inner core, which rotates independently from Earth’s surface, slowed down — but it didn’t stop or reverse direction.

A study suggests the Earth’s inner core, which rotates independently from Earth’s surface, slowed down — but it didn’t stop or reverse direction.