Our Sun has provided an essentially constant amount of heat and light to Earth for about 4.5 billion years. Every second, a star like our Sun converts 4 million tons of its material into heat and light through the process of nuclear fusion. The simple answer is that deep inside the core of the Sun, enough protons can collide into each other with enough speed that they stick together to form a helium nucleus and generate a tremendous amount of energy at the same time. What makes stars shine StarChild Question of the Month for September 1999 Question:
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