The Sun is the star of the day, a nuclear furnace that converts every second 4 million tons of hydrogen into energy, while at the same time it fuses 600 million tones of hydrogen into helium. The composition of the Sun is 73% hydrogen and 25% helium. Modern studies, with instruments on Earth or with satellites in space (such as in orbit around the Earth or at the so called Lagrange points or even missions that have approached the Sun) have revealed to us some amazing secrets