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The Big Bang represents the prevailing cosmological model for the observable universe's early history, explaining its expansion from an extremely hot and dense initial state. This theory suggests that around 13.8 billion years ago, a massive explosion led to rapid inflation, giving birth to all known forms of matter and energy. As part of Cosmology within Space Science and Science more broadly, The Big Bang subcategory delves into the detailed processes, evidence, theories, and ongoing research concerning this monumental event, which continues to shape our understanding of the universe's origins and evolution.