Abstract
Energy manifests itself in many forms in the cosmos, chief among these being kinetic, thermal, gravitational, nuclear and magnetic. Magnetic energy is associated with electric currents flowing in conducting matter, such as the ionised gas of the insides of stars, or the deep liquid metal interiors of planets like the Earth. In the absence of electromotive forces (like those in the humble chemical battery), these electric currents, and the magnetic fields they generate, will always decay and the magnetic energy will in turn be converted to heat.
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