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As we know that, when nuclear fusion acts on the Sun the helium gas is produced and other heavier elements up to iron(this process is known as Nucleosynthesis).
Many scientist believe that when hydrogen is used up the sun will become a big star like a dawning sun.All water on earth will be heated and convert into water vapour.
Then after some time it will become small in size and become a small white dwarf planet after some more time it will vanish and turn into small black dwarf planet.
But many scientist also believe that the product helium will also do nuclear fission and will make sun burning.
after hydrogen used up and it will become like small white dwarf plant.
hoping it helps
it gives huge amount of heat energy
It will not be able to burn as we know that all gases present in sun is responsible for its burning. if hydrogen changes then there will be change in its chemical reaction and will lead to prevention of burning.
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