The last magnetic reversal occurred approximately 780,000 years ago, during the Brunhes-Matuyama reversal.
This event marked a complete flip of Earth's magnetic poles, where the north magnetic pole became the south magnetic pole and vice versa.
These reversals are a natural phenomenon that occurs irregularly, with no predictable pattern.
Scientists study these reversals by examining the magnetic signature preserved in rocks and sediment layers.
The magnetic field plays a crucial role in protecting Earth from harmful solar radiation. During a reversal, the magnetic field weakens, potentially exposing the planet to increased radiation levels.
While the exact timing of the next reversal is unknown, scientists estimate that it could occur within the next few thousand years.
However, it's important to note that the current magnetic field is weakening at a faster rate than previously observed, suggesting that a reversal might be closer than expected.
