The deuterium nucleus captures another proton to form helium-3, a stable light isotope. The CNO cycle, which stands for Carbon-Nitrogen-Oxygen, acts as a catalytic process where carbon, nitrogen, and oxygen isotopes facilitate the fusion of protons into helium.
How Fusion Reactions Power the Sun's Core
Once the energy breaches the surface, known as the photosphere, it is radiated into space as visible light, infrared, and ultraviolet radiation, providing the warmth that sustains life on Earth. Mass Loss and Stellar Evolution While the proton-proton chain is responsible for the majority of the Sun's energy, particularly in its current phase, the Sun also utilizes a secondary fusion process known as the CNO cycle.
The CNO cycle, which stands for Carbon-Nitrogen-Oxygen, acts as a catalytic process where carbon, nitrogen, and oxygen isotopes facilitate the fusion of protons into helium. This slow process of diffusion can take tens of thousands of years for a single photon to reach the surface.
How Proton-Proton Chain and CNO Cycle Fusion Power the Sun
This cycle becomes more significant in stars that are hotter and more massive than the Sun, and it contributes a smaller but notable portion of the Sun's total energy output. Eventually, the core will contract and heat up enough to initiate the fusion of heavier elements like helium, marking the transition from the main sequence phase to the red giant stage, a dramatic transformation that will reshape the entire solar system.
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