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Why is the sun growing?
Answer 1:

The sun is burning hydrogen to make helium. Until the helium core of the sun gets much more massive, it will not collapse to the point where it can burn helium to make carbon and oxygen. This means that there is a shell expanding outward through the sun where the hydrogen is being fused, which pushes the envelope out. Beyond that I'm not sure, but the sun is slowly (very slowly) becoming a red giant.



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