National Geographic Society

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The Clean Room

Strong observational evidence exists to support the Big Bang theory, includeing the amount of helium in the cosmos and the glow of radio waves left over from the explosion. As it expanded, the universe cooled, causing darkness for about 200 million years.

Next Airing:

The little known but heroic story of a guy from Iowa that can't really be told without going all the way back to the time long before the Earth was formed - to the origin of the elements in the hearts of stars.