Wednesday, November 2, 2005

First Stars in Universe Detected?

Let there be light.

The big bang did not bring into existence the universe as we know it. After the universe cooled enough for molecules to form, it became a "formless void" of hydrogen clouds. After a hundred million years, gravity began to concentrate the clouds until they began to coalesce into supermassive stars. The bigger a star is, the shorter its lifespan. These stars were so large that they lasted only sixteen million years apiece, flaming out as giant supernova.

But those giant supernova introduced the heavier elements into the universe - metals, carbon, oxygen - that the next generations of stellar objects would use as the universe began to take shape in a way recognizable to us today.

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