Characteristic of sun :
* diameter : 1392000 km
* mass : 1.989 X 10 the power of 34 kg
* density : 1485 kg m the power of -3
* surface temperature : 5500-6000 degree celcius
* composition : composed of about 70% hydrogen, 28% helium and other elements such as carbon, nitrogen , oxygen, silicon and iron which amount to less than 2%.