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Originally Posted by Augustus Vox
I sorta thought that might have a bearing on it but I don’t understand how that works (with regards to point #2). Does anyone know the science behind it?
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As I understand it, electrons get free in the molten metal. Then when they move in circular orbits around the earth's axis, they are basically forming an electric current. The magnetic field "B" is proportional to the electric current "I". Also, as the rotation rate increases, "I" increases also. So slower rotations have smaller electric currents (like Venus) and hence lower magnetic fields.
I think they are still researching the details, but that is a pretty good explanation.