Question

The sun and stars glow because of the presence of

Answer 1

Helium gas is in excess in both sun and stars that's why they glow.

Answer 2

Stars shine because they are extremely hot (which is why fire gives off light — because it is hot). The source of their energy is nuclear reactions going on deep inside the stars. In most stars, like our sun, hydrogen is being converted into helium, a process which gives off energy that heats the star.Which causes to the formation of plasma. So, the sun and stars glow because of the presence of plasma.