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The Big Bang Theory says that the Big Bang was to have happened about 14 billion years ago. At this time the entire universe was inside a bubble in space that was so small that it was thousands of times smaller than a pinhead. It was hotter and denser than we could ever have imagined, until it suddenly exploded and the world we know now was born. The universe grew from that point and is still growing in size today. The heat and density of this bubble caused it to explode.
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