Multiple choice

During which stage of a star's life cycle do the outer layers expand, but its core contracts?

  1. main-sequence

  2. protostar

  3. white dwarf

  4. supergiant and giant
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

When a star exhausts its hydrogen fuel, the core contracts and heats up, causing the outer layers to expand and cool, transforming the star into a giant or supergiant.

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