* Sun's Core: The core of the Sun has a temperature of about 15 million degrees Celsius (27 million degrees Fahrenheit). This intense heat is generated by nuclear fusion, where hydrogen atoms combine to form helium, releasing enormous amounts of energy.

* Earth's Core: The Earth's core, in contrast, has a temperature of around 5,200 degrees Celsius (9,392 degrees Fahrenheit). This heat is generated by the decay of radioactive elements within the Earth.

So, while the Earth's core is incredibly hot, the Sun's core is significantly hotter due to the ongoing nuclear fusion reactions that occur within it.