Question

What is happening inside a star while it expands into a subgiant?

• A. It is fusing hydrogen into helium in the core.
• B. It is fusing hydrogen into helium in a shell outside the core.
• C. It is fusing helium into carbon in the core.
• D. It is fusing helium into carbon in a shell outside the core.

Answer 1

Answer: (B)

It is fusing hydrogen into helium in a shell outside the core.

Fusion reactions take place and all hydrogen gets fuses to helium, thereby depleting hydrogen completely