1. big bangAstronomy, etc. term, Finance term, See also 宇宙大爆発 うちゅうだいばくはつ
Wikipedia definition
2. Big BangThe Big Bang theory is the prevailing cosmological model that explains the early development of the Universe. According to the Big Bang theory, the Universe was once in an extremely hot and dense state which expanded rapidly. This rapid expansion caused the Universe to cool and resulted in its present continuously expanding state.
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