If we look back into the geologic record of the Earth, it appears that our planet’s magnetic field flips polarity every few hundred thousand years or so. Why does this happen? When’s it supposed to happen next? Is it dangerous? Visit the Astronomy Cast Page to subscribe to the audio podcast! We usually record Astronomy … Continue reading "Astronomy Cast Ep. 442: Destroy and Rebuild Pt. 6: Magnetic Pole Reversal"