Exam-style question
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How do apparent magnitude and absolute magnitude differ?.
- A.Apparent magnitude measures brightness from Earth; absolute magnitude measures intrinsic brightness.
- B.Apparent magnitude is constant; absolute magnitude varies with distance.
- C.Apparent magnitude is measured in parsecs; absolute magnitude is measured in light-years.
- D.Apparent magnitude is for all stars; absolute magnitude is only for nearby stars.
Model answer
What a good answer should say
- Apparent magnitude measures brightness from Earth; absolute magnitude measures intrinsic brightness.
Explanation
Why this works
Apparent magnitude is defined as the brightness of a star as seen from Earth, while absolute magnitude measures the intrinsic brightness of a star at a standard distance of 10 parsecs. This key difference allows astronomers to distinguish between how bright a star appears and its true luminosity.
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