The moon doesn’t have a magnetic field, so why does it have magnetic rocks? // Space.com
MIT astronomers found evidence that a massive asteroid impact billions of years ago may have briefly amplified the moon’s old, weak magnetic field, leaving behind a magnetic imprint still detectable in lunar rocks. “While the moon once had a weak magnetic field generated by a small molten core, the team’s research suggests it likely wouldn’t have been strong enough on its own to magnetize surface rocks. However, a massive asteroid impact may have changed that — at least briefly.”
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