Inner core of Earth slowed down since 2010, study finds

A recent study suggests that the Earth's inner core began slowing down around 2010, moving slower than the surface for the first time in decades. This change is attributed to interactions with the liquid outer core and the rocky mantle. The inner core, a solid iron-nickel sphere, is roughly the size of the Moon and located over 4,828 km beneath the surface. The study was published in Nature.