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Scientists pin down timing of lunar dynamo’s demise

1 Jan 2020, 18:59 UTC
Scientists pin down timing of lunar dynamo’s demise Hernán Cañellas and Benjamin Weiss

A conventional compass would be of little use on the moon, which today lacks a global magnetic field. 

But the moon did produce a magnetic field billions of years ago, and it was likely even stronger than the Earth’s field today. Scientists believe that this lunar field, like Earth’s, was generated by a powerful dynamo — the churning of the moon’s core. At some point, this dynamo, and the magnetic field it generated, petered out.

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