The inner Earth is a mysterious place, and now scientists may have uncovered a strange new secret. According to a new study, the Earth’s inner core may have recently stopped rotating, relative to the surface, as part of a decades-long cycle.
With thousands of miles of rock in the way, it’s hard to get a good look at exactly what’s going on in the center of the Earth. Scientists have to study it indirectly by measuring magnetic field changes, ancient crystals, or how seismic waves from earthquakes propagate through different layers. This has helped geologists learn new details, including that the core could be made of a superionic iron alloy.