What causes solar radiation?

Solar radiation is caused by nuclear fusion that takes place in the sun.Fusion occurs when protons of hydrogen atoms violently collide in the sun’s core and fuse to create a helium atom. This process, known as a PP (proton-proton) chain reaction, emits an enormous amount of energy. At its core, the Sun fuses about 620 million metric tons of hydrogen every second. Solar energy is constantly flowing away from the sun and throughout the solar system.

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