Eventually, billions of year down the road, a star uses up the last of its hydrogen fuel. The helium byproduct from this fusion reaction slowly builds up in the core of a star, and they have no way to get rid of it. Our own Sun has been performing fusion at its core for 4.5 billion years, and will continue to do so for another 7 billions years, at least. Don’t panic, we’ve got another 7 billion years or so before the Sun becomes a red giant star.Īs you probably know, stars shine because they’re converting hydrogen into helium in their cores through a process called nuclear fusion. Astronomers call these objects red giant star, and you’ll want to learn more about them, since this is the future fate for the Sun. When star like our Sun reaches the end of its life, it enters one last phase, ballooning up to many times its original size.
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