Exam-style question
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How does the luminosity of quasars relate to their classification as active galactic nuclei?.
- A.Quasars have low luminosity compared to other galaxies
- B.Quasars are the most luminous objects in the universe
- C.Quasars emit no radiation
- D.Quasars are less luminous than stars
Model answer
What a good answer should say
- Quasars are the most luminous objects in the universe
Explanation
Why this works
Quasars exhibit extremely high luminosity, often outshining entire galaxies. This luminosity is due to the accretion of material onto supermassive black holes at the centers of galaxies, classifying them as active galactic nuclei.
The implication is that their brightness allows us to study the early universe, leading to conclusions about the formation and evolution of galaxies.
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