Here's a cool picture showing the layers of a star before collapse http://upload.wikimedia.org/wikipedia/commons/3/37/Evolved_star_fusion_shells.svg http://uplo

Here's a cool picture showing the layers of a star before collapse http://upload.wikimedia.org/wikipedia/commons/3/37/Evolved_star_fusion_shells.svg http://upload.wikimedia.org/wikipedia/commons/3/37/Evolved_s...