Astronomical objects in the space beyond the earth are fascinating and enigmatic. We belong to the planetary system of our home star, the Sun, which is our source of energy on Earth. The Sun is a gigantic ball of hot plasma, the fourth and most prevalent state of matter (over 99% of matter in the universe is plasma, not solid, liquid or gas). It is very important to know how the Sun generates its energy, how that propagates as radiation, what are the solar constituents and elemental abundances, and what are the plasma conditions throughout the Sun.
