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Composition: The sun is primarily composed of hydrogen (about 74%) and helium (about 24%), with small amounts of heavier elements.
Energy Production: The sun generates energy through nuclear fusion, where hydrogen atoms fuse to form helium, releasing a tremendous amount of energy in the form of light and heat.
Size and Mass: The sun has a diameter of about 1.39 million kilometers (864,000 miles) and a mass approximately 330,000 times that of Earth.