Final answer:
The Sun's heat is generated by nuclear fusion reactions converting hydrogen into helium, releasing vast amounts of energy that radiate outwards to warm the Earth.
Explanation:
The Sun is heated through nuclear fusion reactions where hydrogen atoms fuse into helium atoms, releasing a tremendous amount of energy. This process occurs in the Sun's core, where the temperature and pressure are incredibly high, allowing the fusion reactions to take place.
As a result of nuclear fusion, the Sun radiates energy in all directions, and some of it reaches the Earth, providing heat and light. This continuous energy production sustains the Sun's immense heat and brightness over billions of years.
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