SOLAR SYSTEM

Detailed explanation-1: -About three quarters of the sun is hydrogen, which is constantly fusing together and creating helium by a process called nuclear fusion. Helium makes up almost the entire remaining quarter.

Detailed explanation-2: -It is, as all stars are, a hot ball of gas made up mostly of Hydrogen.

Detailed explanation-3: -The more atoms of a particular element that exist on the sun’s surface, the more light the atoms absorb and the stronger the spectral lines. Spectral lines thereby can reveal an element’s abundance relative to hydrogen, which is the sun’s main ingredient.