Exam-style question
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Explain the post-main-sequence evolution of a star and how its characteristics change during this phase.
Model answer
What a good answer should say
- After exhausting hydrogen in the core, a star leaves the main sequence and begins to fuse helium and other heavier elements.
- This leads to expansion and cooling, resulting in the star becoming a red giant.
- The core contracts while the outer layers expand, and eventually, the star may shed its outer layers to form a planetary nebula, leaving behind a white dwarf.
Explanation
Why this works
This question assesses the ability to articulate the changes a star undergoes after the main sequence phase. A comprehensive answer should include the processes of fusion, changes in size and temperature, and the eventual fate of the star, demonstrating a clear understanding of stellar life cycles.
Common mistake
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