We often hear that in recent years, the use of energy by humanity has increased so much that fossil resources will run out in a couple of decades. But the same was said in the 70s of the last century. Where do we get energy for existence today and what should we do next? For the development of technology, it is necessary to understand how to effectively transform it into work, because energy is not an infinite resource even on an astronomical scale. Almost all the energy that exists on Earth and that people can extract from the solar system is the energy of the Sun, which has a finite lifetime, and all the energy in the Universe is limited by what the Big Bang gave us. But what is energy?
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