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Where does energy come from?

Energy can come from the complete destruction of matter (as in nuclear reactions), or the rearrangement of electrons or other charged particles inside matter (as in chemical reactions) or from electromagetic fields (as in light and heat radiation), or from the deceleration or pressure drop of moving matter (as in hydroelectric or wind power).

Here on Earth, most of the energy that we use comes from the sun, or from the combustion of fossil fuels that were produced by the light from the sun at an earlier time, or from nuclear reactions involving isotopes like U-235 and deuterium that were present before the Earth and sun were formed.

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