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The earth actually has two primary sources of energy: external the Sun, and internal Geothermal. The Geothermal source is due to radioactive decay deep in the earth. A few of these elements that are heating the inside of the earth can also be mined when they are present near the surface and used by man. One of these (uranium) provides the energy for nuclear power plants to make electricity. All of these radioactive elements were produced in supernova explosions long before our solar system formed, so Geothermal energy also came from stars (but long dead ones, unlike the Sun which is very much a living star).

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