As a Star Becomes a Giant, Its Outer Layers Are

question 20

Multiple Choice

As a star becomes a giant, its outer layers are expanding. Where does the energy for expanding these layers come from?

• A) from the fusion of helium into carbon in the core
• B) from the long-term fusion of hydrogen into helium in the core
• C) from an explosion in the core
• D) from a magnetic dynamo effect in the star's outer layers, caused by a much stronger magnetic field inside the star
• E) from the fusion of hydrogen into helium in a shell around the core