December 4, 2022
The visible surface of the sun is called the photosphere. Its temperature is about 10,000 °F, which is what determines the yellowish appearance for us on Earth. The core of the sun has a temperature of roughly 27 million °F. The high pressure and heat of the core allows nuclear fusion to occur. Nuclear fusion is one of the processes that creates the heavier elements of the universe.
This diagram shows the layers of the Sun, including the photosphere. Image credit: Kelvin Ma