What would happen if all the hydrogen of the sun turns to helium? Give reasons why will hydrogen turn into helium?

Dear Student,

When most of the hydrogen of the Sun is used up then Size of the Sun increases and its heat decreases as  it tries to fuse higher elements like Lithium etc.
When it reaches to iron limit (tries to fuse Iron), it expands up to the size of earth orbit and Sun will become the White Dwarf Star.


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