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答The Big Bang theory is a scientific explanation for the origins of the universe. It states that the universe began as a singularity, a point of infinite density and temperature, approximately 13.8 billion years ago. This singularity then rapidly expanded and continues to expand to this day.According to the Big Bang theory, the universe was initially very hot and dense, and it has been cooling and expanding ever since. As the universe expanded, matter and energy began to form. After about 380,000 years, the universe had cooled enough for atoms to form, and light was able to travel freely through space. This event is known as the cosmic microwave background radiation.Over billions of years, matter began to clump together under the influence of gravity, forming galaxies, stars, and planets. The formation of galaxies and the evolution of stars are ongoing processes in the universe.The Big Bang theory is supported by a range of observational evidence, including the expansion of the universe, the abundance of light elements, and the cosmic microwave background radiation. However, there are still many unanswered questions about the early moments of the universe, such as what caused the singularity to explode and what happened before the Big Bang. Scientists continue to study and refine the Big Bang theory in order to better understand the origins and evolution of the universe.

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