Exam-style question
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What does the brightness data of a star indicate about its distance from Earth?.
- A.Brighter stars are always closer to Earth.
- B.Brightness data can indicate distance using inverse-square law.
- C.All stars have the same brightness regardless of distance.
- D.Brightness data is unrelated to a star's distance.
Model answer
What a good answer should say
- Brightness data can indicate distance using inverse-square law.
Explanation
Why this works
The evidence shows that brightness data can be used to calculate distance through the inverse-square law. This implies that as a star moves further away, its apparent brightness decreases.
Therefore, we can conclude that brightness data is essential for determining the distance of stars from Earth.
Common mistake
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