The poles can flip over the course of hundreds or thousands of years, and this can happen at random, with intervals ranging anywhere from 10,000 years to 50 million years or more. Around 41,000 years ...

The last full reversal took place approximately 780,000 years ago - leaving some experts to predict another flip is imminent.

Earth's magnetic field protects from solar radiation. It originates from molten core motion. Magnetic north pole moves constantly. Field reversals occurred in the past. The field weakens in some areas ...