Exam-style question
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What does a star's absolute magnitude tell us compared to its apparent magnitude?.
- A.Absolute magnitude is always brighter than apparent magnitude.
- B.Apparent magnitude is measured from a standard distance.
- C.Absolute magnitude reflects intrinsic brightness at a standard distance.
- D.Both magnitudes are the same.
Model answer
What a good answer should say
- Absolute magnitude reflects intrinsic brightness at a standard distance.
Explanation
Why this works
The evidence shows that absolute magnitude measures a star's intrinsic brightness as if it were placed at a distance of 10 parsecs. This implies that it allows for a fair comparison of stars regardless of their distance from Earth.
Thus, we conclude that absolute magnitude is crucial for understanding a star's true luminosity.
Common mistake
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