![]() ![]() Currently, less than 2% of the sun’s energy is created by the CNO cycle. The CNO cycle also converts hydrogen to helium, but relies on carbon, nitrogen, and oxygen (C, N, and O) to do so. In stars that are about 1.3 times bigger than the sun, the CNO cycle drives the creation of energy. The temperature for these stars is around 4 million degrees on the Kelvin scale (about 4 million degrees Celsius, 7 million degrees Fahrenheit). The PP chain reaction occurs in other stars that are about the size of our sun, and provides them with continuous energy and heat. In its core, the sun fuses about 620 million metric tons of hydrogen every second. This process, known as a PP (proton-proton) chain reaction, emits an enormous amount of energy. ![]() Fusion occurs when protons of hydrogen atoms violently collide in the sun’s core and fuse to create a helium atom. Solar energy is created by nuclear fusion that takes place in the sun. Solar energy is any type of energy generated by the sun.
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