LIFE OF STAR - SUPER NOVA

• All stars are like our sun but having different Mass, brightness and temperature.

• Nuclear reactions are continuously being carried out in all stars.

• The star contains mainly Hydrogen that continuously gets converted to Helium and subsequently to higher elemental form.

• When all hydrogen gets consumed up the nuclear reaction in the star gets reducing and slowly the temperature of the star comes down.

• The reducing temperature further reduces the rate of nuclear reactions and the drop in temperature increases continuously.

• Ultimately the nuclear reactions in the star stops and it becomes a small ball of solid materials - known as white dwarf.

• Size of white dwarf varies from 50,000 to 200,000 kms. In diameter.

• This would be the end of our sun and other stars like it.

• However there are stars in our galaxy / universe, which are five times bigger than our sun or more.

• These bigger stars meet a different kind of end of their life.

• These stars explode at the end of their life. They are known as Nova.

• The stars having mass more than eight times that of our sun explode with great intensity and are known as Super Nova.

• When Super Nova explodes it leaves behind heavy material at its nuclear, in form of Neutron star at its place.

• The lighter material containing certain amount of heavy materials also spreads out during the explosion.

• The material left behind as neutron star is usually one third of the total mass of star.

• During life of star, heavy elemental materials keep forming wide sophisticated nuclear reactions. As the heavy elements get forming they keep moving towards centre of the star.

• The material constituents of the star just prior to the Super Nova explosion is as per that shown in the figure (e).

• The material exploded during the super nova explosion plays very important role in our life.

• It can also be said that the life existing in the Universe is mainly because of these Super Nova Explosions.

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