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The sun is expanding and burning increasingly brighter because of its diminishing fuel supply; hydrogen. The sun is constantly fusing hydrogen atoms, situated in its core, into helium atoms. As the hydrogen supply begins to run low, the sun increases its density and temperature to maintain a constant energy generation rate, or rate of "fusion". The rise in density and temperature causes more energy to rise to the sun's surface, and creates a thicker, but lighter, outer layer.

So, the sun is not exactly growing; its matter is merely being distributed in a different and slightly more inconsistent way.

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Q: Why does the sun want to expand?
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