Sun

 The Sun's fiery nature, along with a tremendous gravitational pull and an extensive magnetic field, helped it to become the heart of our solar system.

The sun can be divided into six layers or regions:

the corona,

the chromosphere,

the photosphere,

the conductive zone,

radiative zone, and

the core.

In terms of atom count, the sun is about 91% hydrogen, the Sun's fuel, 8.9% helium and zero 0.1% heavier elements, such as carbon and nitrogen.