Exam-style question
Try this first
Which of the following best describes a quasar?.
- A.A type of star.
- B.A supermassive black hole surrounded by an accretion disk.
- C.A planet orbiting a distant star.
- D.A nebula in the Milky Way.
Model answer
What a good answer should say
- A supermassive black hole surrounded by an accretion disk.
Explanation
Why this works
Quasars are powered by supermassive black holes at the centers of galaxies, where material falling into the black hole forms an accretion disk. This process generates immense luminosity, making quasars some of the brightest objects in the universe.
Common mistake
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