Exam-style question
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What is the significance of the spectral class of a star?.
- A.It determines the star's distance
- B.It indicates the star's brightness
- C.It classifies the star by temperature
- D.It measures the star's mass
Model answer
What a good answer should say
- It classifies the star by temperature
Explanation
Why this works
The spectral class of a star is based on its absorption spectrum, which is directly related to its surface temperature. This evidence shows that different spectral classes correspond to different temperature ranges.
The implication is that knowing a star's spectral class allows astronomers to infer its temperature. Thus, the conclusion is that the spectral class is crucial for classifying stars by their temperature.
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