What happens when a star dies depends on its mass. If a very massive star runs out of fuel, it explodes in a huge event called a supernova. But a more modestly sized star, like our sun, will puff up to become a red giant before throwing off its outer layers of gas to form a nebula, a process which leaves behind a small, dense core called a white dwarf. White dwarfs, or dead stars, no longer make their
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