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The Big Bang theory provides the initial framework for understanding the origin of the universe. According to this theory, approximately 13.8 billion years ago, the universe began as an extremely hot and dense point and expanded rapidly, giving rise to matter, energy, space, and time. As the universe cooled, hydrogen and helium atoms formed, eventually leading to the creation of stars and galaxies. Within stars, nuclear ___ _________ ___ _________ _______ _____ _____ _________ _________ _______.
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