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What was the Big Bang?
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The Big Bang is the name given to the explosion that astronomers think started the universe. It was an unimaginably enormous explosion. All the material in the universe was in the form of energy, condensed into a tiny space. The temperature was probably about 10,000 million degrees Centigrade. When the Big Bang happened, the energy began to spread out. The temperature fell and atoms started forming. Gradually the atoms clumped together and the first galaxies were made. The outer galaxies of the universe are rushing away into space at great speed, showing that the universe is still expanding after the Big Bang. | | Matter formed in the Big Bang collected in clouds. The clouds collapsed inward and formed galaxies. |
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Previous:
Back
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Book:
1001
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Section:
Space
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Chapter:
The Universe
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