Question

What is the best prediction for what will happen when all of the hydrogen in the Sun has undergone fusion?

Helium nuclei will split to form hydrogen, and the Sun will no longer release energy.
Helium nuclei will split to form hydrogen, and the Sun will continue to release energy.
Helium nuclei will fuse to create heavier elements, but the Sun will no longer release energy.
Helium nuclei will fuse to create heavier elements, and the Sun will continue to release energy.

Answer 1

Option 4 is correct.

Helium nuclei will fuse to create heavier elements, and the Sun will continue to release energy.

Explanation:

• The fusion of hydrogen nuclei results in the creation of helium gas.  
• When a significant amount of hydrogen is converted into helium, internal changes begin to occur in the sun.  
• So, when all the hydrogen in the sun undergoes fusion, the sun starts releasing energy and becomes a big red giant.  

Learn more about gases in sun:

Can we make sun by mixing helium and hydrogen and also other gases​

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