Planetary bodies produce magnetic fields through what's known as a core dynamo, slowly dissipating heat causes convection of molten metals in the core. 'Our model shows how that can happen, and it's consistent with what we know about the moon's interior.'
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'But instead of thinking about how to power a strong magnetic field continuously over billions of years, maybe there's a way to get a high-intensity field intermittently. 'Everything that we've thought about how magnetic fields are generated by planetary cores tells us that a body of the moon's size should not be able to generate a field that's as strong as Earth's,' said Alexander Evans, study co-author, from Brown. The processes could have produced intermittently strong magnetic fields for the first billion years of the moon's history, the researchers say. In this new study, geoscientists show that giant rock formations sinking through the moon's mantle could have produced the kind of interior convection that generates strong magnetic fields. However, for decades it wasn't clear how a moon-sized body, a quarter the size of the Earth, could have generated a magnetic field that strong. They have helped planetary scientists better understand how it formed, find what it is made of and now, how it developed and lost a magnetic field.Īnalysis of the rocks revealed that some seemed to have formed in the presence of a strong magnetic field - one that rivalled Earth's in strength - and others didn't.
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Rocks returned to Earth during NASA's Apollo program, from 1968 to 1972, have provided volumes of information about the moon's history.