The process by which hydrogen atoms join together to form helium, inside the sun nuclear fusion in the sun. Nuclear fusion in the sun is the reaction that powers the sun, fusing hydrogen atoms into helium and releasing energy.
Imagine trying to squeeze two very stubborn magnets together with the same poles facing each other, as they keep pushing away from one another. This is similar to what happens in the sun, where hydrogen atoms resist each other due to their positive charges, yet under immense pressure and heat, they are forced to combine to form helium. Just as you need to apply a significant force to overcome the repulsion between the magnets, the sun's core provides the intense pressure and temperature needed to overcome the repulsive forces between hydrogen atoms, allowing nuclear fusion to occur.
