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优质回答The "big bang" theory is a scientific explanation for the origin and development of the universe. According to this theory, the universe began as a singularity, a point of infinite density and temperature, around 13.8 billion years ago. This singularity then rapidly expanded and continues to expand to this day.The evidence for the big bang theory comes from a variety of sources. One of the key pieces of evidence is the observation that distant galaxies are moving away from us in all directions, which suggests that the universe is expanding. This observation was made by Edwin Hubble in the 1920s and has been confirmed by subsequent observations.Another piece of evidence comes from the observation of the cosmic microwave background radiation (CMB). This is a faint glow of radiation that fills the universe and is thought to be the remnant of the intense heat of the early universe. The CMB was first detected in 1965 and has been studied in detail by satellite missions such as the Cosmic Background Explorer (COBE) and the Planck satellite.In addition to these observations, the big bang theory is supported by the successful predictions it has made about the abundance of light elements in the universe, such as hydrogen and helium. The theory also provides an explanation for the large-scale structure of the universe, including the formation of galaxies and galaxy clusters.While the big bang theory is widely accepted by scientists, there are still many unanswered questions about the early moments of the universe and what may have caused the singularity to expand. Current research is focused on understanding the nature of dark matter and dark energy, which are thought to make up the majority of the universe but have not yet been directly detected.

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