The galaxies in the universe appear to be expanding away from each other. If we work backwards, we find that they were close together between 15,000 and 20,000 million years ago. In thisWay the universe began ?
Most astronomers agree that the galaxies are flying away from some explosion that ‘created ‘ the universe. But it is impossible to say why this explosion, or ‘Big Bang’, occurred.
After the ‘Bang’, matter was formed in the tremendous heat, and galaxies were created.
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