Ancient rocks hold proof of Earth's magnetic field. Here's why that's puzzling - Space.com
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]
already existed very early in history. This discovery, however, is… [+4548 chars]
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