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Scientists (and science fiction writers) have speculated about the possbilities of life under the surfaces or on the surfaces of large moons in our solar system or large exomoons of large exoplanets in other star systems. So a good place to find any limits on the possible properties of moons that can have magnetic fields is a scientific discussion of the ...


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Even if the moon weighed twice as much as our planet, given a rotation of 27 days it wouldn't have a major geodynamo, which is proportional to mass, rotation speed and electromagnetic constituents. It has to have higher rotation speed and a lot of iron at the core. The moon's rotation is nearly zero, or once every 27 days compared to our 24 hours. In 2010, a ...


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