ABSTRACT
In the core of the sun a fusion process takes place in which pairs of hydrogen nuclei are fused into helium nuclei. The energy thus released is radiated into space in the form of electromagnetic radiation. As the sun is 143 million km from the earth, it radiates only a tiny fraction of its energy to the earth. In spite of this, the sun offers more energy in a quarter of an hour than the human race uses in a whole year.
