Our Sun is a star. Stars have been visible in the night sky well before the genesis of humanity and even before the appearance of the first life forms on Earth. But what is a star from a physics point of view?SunSunfusion reaction Sunplasma A star can be described as a plasma furnace, generating new, heavier elements through the fusion of atomic nuclei, beginning with the simplest and most abundant element in the universe: hydrogen. Stars consist mainly of hydrogen and helium with small carbon, oxygen, nitrogen, and iron fractions. The Sun is made of 70% of hydrogen and 25% of helium and other elements. Plasma, the most prevalent form of matter in the universe, differs from solids, liquids, and gases by being ionized—a state where electrons have been separated from ions. When referring to plasmas within stars, one typically alludes to exceedingly high temperatures, often reaching tens of millions of degrees at the core of these celestial bodies, 15 million degrees Celsius in the case of our sun [56].