Exam-style question
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What does the luminosity axis on the Hertzsprung-Russell diagram represent?.
- A.The distance of the star from Earth
- B.The power output of the star
- C.The temperature of the star's surface
- D.The age of the star
Model answer
What a good answer should say
- The power output of the star
Explanation
Why this works
The luminosity axis indicates the total energy output of a star per unit time. This shows that stars with higher luminosity are more powerful, which implies they have greater energy production processes occurring within them.
Therefore, understanding luminosity is crucial for classifying stars based on their energy output.
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