Sun Produces Energy

Light and heat comes from the sun. 

Some people believed that the sun is a giant burning coal., others idea that the meteorites falling into the sun released its energy. 

 The nuclear energy in the sun is eminence. 

Thermonuclear fusion where nuclei of atoms join together.

The changing of Hydrogen into helium in the sun results in release into heat and light.
 Hydrogen , the most abundant element in the universe makes up approximately three-fourths of the sun's mass.