Where does energy come from?

Question: Where does energy come from?

Answer: Energy is neither created nor destroyed. All the energy in the universe was created (according to current theories) at the moment of the Big Bang. The energy that we use on Earth mostly comes from the Sun but some of it is also contained within the Earth itself. Energy from the Sun creates wind, gravity from the Sun (and Moon) causes tides, hydro power uses water obtained by the condensation and evaporation cycle driven by the Sun, solar power relies on light from the Sun, and biological energy relies on photosynthesis powered by the Sun. One exception to all of these Sun powered energy sources is geothermal which obtains energy from the molten core of the Earth which is still cooling. Even fossil fuels are technically a biological energy source as they are derived from ancient organic matter.

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