In the First Stage After Main-Sequence Hydrogen Fusion, the Envelope

question 66

Multiple Choice

In the first stage after main-sequence hydrogen fusion, the envelope of the star is pushed outward to expand. The nuclear reactions that produce the outward pressure for this expansion are

• A) hydrogen fusion in the core.
• B) hydrogen fusion in the shell.
• C) helium fusion in the core.
• D) helium fusion in the shell.

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