what is big bang theory?
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The Big Bang theory is a cosmological model of the observable universe from the earliest known periods through its subsequent large-scale evolution. The model describes how the universe expanded from an initial state of extremely high density and high temperature, and offers a comprehensive explanation for a broad range of observed phenomena, including the abundance of light elements, the cosmic microwave background radiation, and large-scale structure.
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Scientists suggest that some 10 to 20 millions of years ago , a massive blast called the Big Bang theory.
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