![]() The energy produced by stars moves ( radiates) away from them. Nuclear fusion changes hydrogen into helium. ![]() ![]() In the Sun (but not all stars) the change which takes place is the production of helium, with minute (very small) amounts of heavier elements. Nuclear fusion makes light and heat and makes bigger chemical elements. Stars like the Sun are hot because this nuclear reaction happens inside them. The reaction changes hydrogen to helium and gives off heat. The amount of material in a star (its mass) is so huge that it starts a nuclear reaction going. ![]() The Sun is a star at the centre of the solar system. They give out heat and light because they are very hot. The Crab Nebula, remains of a supernova that was first seen around 1050 ADĪ star is a very large ball of bright glowing hot matter in space. ![]()
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