WHAT IS SUPERNOVA ??

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WHAT IS SUPERNOVA ??


INTRODUCTION

 supernova is an very big explosion of star.it is a very big explosion take place in a space.

credit : NASA 

 CAUSES

 a supernova happens when a change in core or center of a star is occur.a change can occur in two ways, but end of this way is same.

 TYPE I SUPERNOVA

this type of supernova have a absorption line.this line is show that a star do not have any more hydrogen in them.this type of supernova are very bright in sort time.this type of supernova happens when a white dwarf is orbiting a big star.

 TYPE II SUPERNOVA

 the absorption line of supernova show that they do have hydrogen in them.a star must have at least 8 times the mass of the sun and no more than 45 times of mass of the sun to undergo this explosion.
Supernova: Five Stages in the Death of a Star

 1. Just before explosion A red super-giant star approaches the end of its life. There is no more fuel to burn and make it shine. Soon its massive dense core is bound to collapse under its own weight.

 2. The first light flash The core collapses and sends a shock wave out. For a few hours the shock compresses and heats the envelope, thus producing a very bright flash of light from the inside of the star.

 3. The flash has gone After hitting the surface at 50 million km/h the shock blows the star apart. The core turns into a neutron star, a compact atomic
nucleus with the mass of the Sun but 10 km in size.

 4. The proper Supernova The hot glowing surface expands quickly making the fireball brighter again. In a few days it will be 10x the size of the original star and will be discovered by supernova hunters.

 5. A long time after The remains of the former star are spread over light years of space. They keep floating quickly, sweeping up interstellar gas here and there, leaving a faint beautiful glow behind…

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