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because its fuel will run out.

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βˆ™ 11y ago
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βˆ™ 4mo ago

The sun is powered by nuclear fusion in its core, converting hydrogen into helium. Eventually it will run out of hydrogen fuel and start fusing helium, leading to its expansion into a red giant and eventually shedding its outer layers, forming a planetary nebula. This process will happen in about 5 billion years.

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Q: Why wont the sun last forever?
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