Earth’s core wobbles every 8.5 years, new study suggests

Scientists in China recently made a discovery at the heart of our planet: Every 8.5 years, the Earth’s inner core wobbles around its rotational axis. This shift is likely caused by a tiny misalignment between the inner core and the Earth’s mantle—the layer below the Earth’s crust, according to the researchers’ new study. 

Starting around 1,800 miles (2896 km) beneath the surface, Earth’s…