The sun head of the solar system. It is one of the stars of the universe and nearest to the earth. The sun is made up of the Hydrogen and Helium gases. The surface temperature of the sun is 6000'C. The sun is a very hot ball of diameter 1400000 km.This is about 109 times bigger than the earth. The age of the sun is 500 Billion years.The proposed life of a star is 1000 Billion years.