In 2023, seismologists at the Australian National University, reading the echoes of earthquakes ringing back and forth through the whole planet, confirmed Earth hides an innermost core inside its inner core, a distinct iron ball roughly 1,300 kilometres a

In 2013, seismologists reading the echoes of large earthquakes found a distinct iron sphere at Earth's centre, about 650 kilometres across, whose crystals point a different way from the layer around…