HomeAstronomyMassive space rock impact may have started Earth's magnetic field

Massive space rock impact may have started Earth’s magnetic field

Our planet’s magnetic field is a prodigy and not a late bloomer, a new study suggests.

The protective magnetic field surrounding Earth is so strong that it must have formed early in our history, but there’s a complication to timing that: Earth likely got whacked by a Mars-size protoplanet 4.5 billion years ago. That crash may be connected to how our magnetic field was formed.

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