Ancient rocks hold proof of Earth's magnetic field. Here's why that's puzzling - Space.com

These rocks offer evidence that Earth had a strong magnetic field 3.7 billion years ago, but scientists aren't sure where that field could've come from.

By: Space.com

Apr 26 2024
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A 3.7-billion-year-old record of our planet's ancient magnetism has been unearthed, providing evidence that Earth's magnetic field already existed very early in history. This discovery, however, is… [+4548 chars]

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