For decades, scientists have pondered the mystery of the moon's ancient magnetism. Based on analyses of lunar samples, its now-deceased magnetic field may have been active for more than 1.5 billion years—give or take a billion years. Scientists believe it was generated like the Earth's via a dynamo process, whereby the spinning and churning of conductive liquid metal within a rocky planet's core generates a magnetic field.
retrieved 11 October 2023 from https://phys.org/news/2023-10-magnetic-spacecraft-contamination-extraterrestrial-samples.html
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