In the month of May, solar energy and the Sun itself are celebrated in all countries of the world. This star is not the most powerful of all existing ones, but it is located closer than other stars to the Earth, and thanks to this, its light is very bright for us. The sun is made mostly of hydrogen. There is much less helium in the composition, but there is much more of it than other elements - iron, nickel, chromium, oxygen and others.