Why Does a Star Grow Larger After It Exhausts Its

question 25

Multiple Choice

Why does a star grow larger after it exhausts its core hydrogen?

• A)The outer layers of the star are no longer gravitationally attracted to the core.
• B)Hydrogen fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.
• C)Helium fusion in the core generates enough thermal pressure to push the upper layers outward.
• D)Helium fusion in a shell outside the core generates enough thermal pressure to push the upper layers outward.
• E)The internal radiation generated by the hydrogen fusion in the core has heated the outer layers enough that they can expand after the star is no longer fusing hydrogen.

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