The hottest part of the Sun is its core.
While the visible surface of the Sun, known as the photosphere, is a scorching 10,000°F (5,500°C), the Sun's core far surpasses this temperature. Here's a breakdown:
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Core Temperature: The core reaches temperatures of approximately 27 million°F (15 million°C). This extreme heat is generated by nuclear fusion, where hydrogen atoms are converted into helium, releasing enormous amounts of energy. This process is what powers the Sun.
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Photosphere Temperature: As mentioned earlier, the photosphere, which we perceive as the Sun's surface, is significantly cooler at around 10,000°F (5,500°C). While still extremely hot by earthly standards, it's much cooler than the core.
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Why the Difference? The core is where nuclear fusion occurs, creating tremendous energy. This energy gradually radiates outwards, losing heat as it travels through the Sun's layers.
In summary, the core of the Sun reigns supreme as the hottest region, far exceeding the temperature of its surface.