A Medium-Mass Star Evolves into a Red Giant Because ____

question 4

Multiple Choice

A medium-mass star evolves into a red giant because ____.

• A) the core expands as new fusion products collect there
• B) the surface of the star becomes cooler
• C) energy from hydrogen shell burning and helium fusion forces the outer layer to expand
• D) the surface of the star becomes hotter
• E) increased stellar winds carry large amounts of material off of the surface of the star

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