Exam-style question
Try this first
Which feature distinguishes quasars from other celestial objects?.
- A.Their rapid variability in brightness.
- B.Their formation from dying stars.
- C.Their lack of emission lines.
- D.Their presence in the Milky Way.
Model answer
What a good answer should say
- Their rapid variability in brightness.
Explanation
Why this works
Quasars are distinguished by their rapid changes in brightness, which occur over short timescales, indicating their compact nature and high energy output.
Common mistake
No common mistake is linked to this question yet.