What is the Sun’s core?
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The Sun’s core is the central region where nuclear fusion occurs, converting hydrogen into helium and releasing energy. It is extremely hot (about 27 million degrees Fahrenheit or 15 million degrees Celsius) and dense.
The core of the Sun is considered to extend from the center to about 0.2 of the solar radius (139,000 km; 86,000 mi). It is the hottest part of the Sun and of the Solar System. It has a density of 150,000 kg/m3 (150 g/cm3) at the center, and a temperature of 15 million kelvins (15 million degrees Celsius; 27 million degrees Fahrenheit).