The Secret Behind the Sun's Burning

The reason the sun emits light is due to hydrogen fusion. However, calculations based on classical physics show that the temperature at the sun's core is far too low to initiate fusion. This is because there isn't enough energy to overcome the strong electromagnetic force pushing protons apart. According to theory, the sun should have cooled down to blackness without ever igniting. What turned this impossibility into a possibility is 'quantum tunneling'. Particles in the microscopic world have a probability of passing through energy barriers like ghosts. As protons fuse by overcoming these barriers with an extremely slim chance, they emit immense light. The warm sunlight we feel every day is actually a miracle brought about by quantum mechanics.