I was reading news article: http://www.sciencedaily.com/releases/2011/11/111115095911.htm Article explains in beginning that when star explodes as supernova, heavier elements are formed which later become part of new generations of stars. And in concluding paragraph, article says "reason why some of the old stars became abnormally rich in heavy elements must therefore be that exploding supernovae sent jets out into space". In the news, I was expecting to find how oldest stars got some metal contents (Since there were no stars present to go supernova). But if they say that supernova is the reason then I wonder what is the news. Am I missing something?