Why will the sun expand?
So I know when the sun runs out of hydrogen, it becomes denser and contracts, but how does a red giant expand? What is happens in this process?
In: Physics
Heat, fusing of hydrogen generates a lot of energy fusing of helium generates a lot more so once a star moves on to fusing helium it heats up and expands. https://youtu.be/64L0Dv55_Cw
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