In the late 1960s and early 1970s, scientists began to realize that the universe was not static, as had been long thought, but was instead expanding. This discovery led to a new theory of the universe, which became known as the Big Bang theory. The Big Bang theory is the prevailing cosmological model for the universe from the earliest known periods through its subsequent large-scale evolution. The model describes how the universe expanded from a very high-density and high-temperature state, and offers a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the cosmic microwave background, large-scale structure, and Hubble's law.
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The big bang theory is the most popular and widely accepted theory of the origin of the universe. It states that the universe began from a single point or event, and has been expanding ever since. The theory is supported by a wealth of scientific evidence, and is the most logical and simplest explanation for the origin of the universe.