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Big BangThe "Big Bang" is the hypothesis scientists like best that explains how our universe would have come into being. According to the Big Bang, there was first a small volumen of very hot matter which had tremendous energy. The matter exploded 15 to 20 billion years ago, and began to expand and to cool. Cooling is a relative term, because temperatures after the first minute are thought to have been about a billion degrees. How did the matter get there to begin with? No one knows!
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