The Life and Death of Stars

I came across this article really a nice one and a must read if you are interested in knowing about stars.....

Astronomers believe that molecular clouds, dense clouds of gas located primarily in the spiral arms of galaxies are the birthplace of stars. Dense regions in the clouds collapse and form "protostars". Initially, the gravitational energy of the collapsing star is the source of its energy. Once the star contracts enough that its central core can burn hydrogen to helium, it becomes a "main sequence" star.

for more click the link given below......
physics.org | Explore | The Life and Death of Stars

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