Question

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

Answer 1

When the suns hydrogen burning main sequence stage ends, the sun will bloat out and turn redder as it begins fusing helium and carbon. It will turn into a red giant and start fusing heavier elements.

Answer 2

Answer:

Helium nuclei will split to form hydrogen, and the Sun will no longer release energy.

Explanation: