Exam-style question
Try this first
What evidence supports the existence of quasars in cosmology?.
- A.High redshift measurements
- B.Low luminosity levels
- C.Stable brightness over time
- D.Absence of spectral lines
Model answer
What a good answer should say
- High redshift measurements
Explanation
Why this works
High redshift measurements indicate that quasars are moving away from us at significant speeds, suggesting they are located at vast distances. This supports the idea that they are among the most distant objects observed in the universe, implying they are early in the universe's history.
Therefore, high redshift is a key piece of evidence for the existence of quasars in cosmology.
Common mistake
No common mistake is linked to this question yet.