Earth's last magnetic field reversal took far longer than once thought

August 18, 2019

Earth's magnetic field seems steady and true--reliable enough to navigate by. Yet, largely hidden from daily life, the field drifts, waxes and wanes. The magnetic North Pole is currently careening toward Siberia, which recently forced the Global Positioning System that underlies modern navigation to update its software sooner than expected to account for the shift.