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The core of a star is primarily responsible for determining its temperature, luminosity, and diameter. In the core, nuclear fusion occurs, generating immense heat and energy, which influences the star's overall temperature and luminosity. Additionally, the balance between the inward gravitational force and the outward pressure from fusion reactions dictates the star's size or diameter. Thus, the processes and conditions within the core play a crucial role in defining these key characteristics of a star.

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3w ago

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