Exam-style question
Try this first
What is the significance of the luminosity of quasars in cosmology?.
- A.It helps determine their distance from Earth.
- B.It indicates their temperature.
- C.It shows their chemical composition.
- D.It measures their gravitational pull.
Model answer
What a good answer should say
- It helps determine their distance from Earth.
Explanation
Why this works
The luminosity of quasars is used to estimate their distance, as their brightness can be compared to their known intrinsic luminosity.
Common mistake
No common mistake is linked to this question yet.