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Supernova is the explosion of a very large star , creating a nebula of illuminated gas that is one of the most visible of all celestial phenomenon...
   i hope that this will help u..........................^_^
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When a star called red super giant runs out all  hydrogen in its core,the surface of star pushed inwards due to gravity and suddenly star's core collapses.the star explodes into a supernova.supernova contains many heavy elements like silicon,iron,etc.
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