Exam-style question
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What happens to a star's position on the Hertzsprung-Russell diagram as it evolves?.
- A.It remains in the same position throughout its life.
- B.It moves to the right as it becomes hotter.
- C.It moves to the left as it becomes cooler.
- D.It can move vertically depending on its luminosity changes.
Model answer
What a good answer should say
- It can move vertically depending on its luminosity changes.
Explanation
Why this works
As stars evolve, their luminosity can increase or decrease, causing them to move vertically on the Hertzsprung-Russell diagram while their temperature may change horizontally.
Common mistake
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