Nuclear fusion in the Sun

Sun is well known for its extreme hotness. Nuclear fusion reaction is responsible for it. Even before we know how nuclear fusion happens in sun. Let us just understand what nuclear fusion reaction is?

Firstly, Sun is made up of enormous amount of Hydrogen and helium. About 75% of Earth is made up of Hydrogen and the rest is Helium. Fusion happens between hydrogen nuclei to form Helium nucleus. This reaction happens at high temperature. This fusion of sun elements is known as proton-proton cycle. The temperature during this reaction is greater than 15 million degrees Kelvin. That’s really huge!

There are two main reactions in fusion i.e.

• Proton-Proton cycle
• CNO cycle

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Nuclear fusion in the Sun