Roughly 42,000 years ago, Earth’s magnetic field weakened dramatically during the Laschamps geomagnetic excursion, allowing more cosmic radiation to reach the atmosphere. In a peer‑reviewed study of ...

Learn how some of Earth’s magnetic field flips last longer than others, weakening our defenses against cosmic radiation.

The Earth's magnetic field and oxygen evolved together over 540 million years, according to a major NASA study.

Deep beneath the ocean floor, ancient sediments hint that Earth’s magnetic field sometimes changed far more slowly than expected.

Earth’s magnetic field has flipped about 170 times in the last 100 m years, and the next reversal is not a matter of if but when. Far from a cinematic instant catastrophe, a flip would unfold over ...

Add Yahoo as a preferred source to see more of our stories on Google. Earth's magnetic field is like an invisible shield that protects our planet from solar and cosmic radiation. While it might not be ...

The geomagnetic field, generated by the convecting motions of Earth’s liquid outer core, is a fundamental facet of our planet’s evolution. Its long‐term behaviour is recorded in rocks through the ...

Earth's magnetic field is generated by the churn of its liquid nickel-iron outer core, but it is not a constant feature. Every so often, the magnetic north and south poles swap places in what are ...

Earth’s magnetic field is a dynamic system generated by turbulent motions in the liquid outer core. These convective processes, modulated by Earth's rotation, arise from complex interactions between ...

Earth's magnetic poles flip in a process called a geomagnetic reversal. The planet's magnetic field is generated by chaotic flows of molten metal deep inside Earth's core.