After a star becomes a red giant,hydrogen fusion
A) no longer occurs.
B) occurs in the core.
C) occurs in a shell around the core.
D) occurs only during the helium flash.

Question

Quizplus · Accepted Answer

After a star becomes a red giant, hydrogen fusion no longer occurs in the core. Instead, it occurs in a shell around the core. This is because the core has become too dense and hot for hydrogen fusion to occur, but the outer layers of the star have expanded and cooled enough to allow hydrogen fusion in a shell around the core.

After a Star Becomes a Red Giant,hydrogen Fusion