A new model for generating a global magnetic field in the ancient moon could help solve a 40-year-old mystery.

The Earth has a magnetic field because it has a spinning solid core surrounded by hot metallic liquid, which churns around lava-lamp style and generates magnetism. But the moon is too small and cool to possess such a molten interior and therefore lacks a global magnetic field.

Source: http://www.wired.com/wiredscience/2011/11/moon-magnetism/

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