Discussion
Big Bang theory explains
Answer: A
The Big Bang theory explains the origin of the universe.
It holds that the universe began about 13.8 billion years ago from an extremely hot and dense state and has been expanding and cooling ever since. The evidence includes the expansion of the universe (galaxies moving apart) and the cosmic microwave background radiation left over from the early universe.
The origin of the sun and the solar system, about 4.6 billion years ago, is explained by the nebular theory, a much later event. The Big Bang is not a law of chemistry, and it has nothing to do with history.
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