Exam-style question
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What observational evidence supports the existence of quasars in cosmology?.
Model answer
What a good answer should say
- Quasars are observed to emit enormous amounts of energy, often outshining entire galaxies.
- This evidence shows that they are powered by supermassive black holes at the centers of distant galaxies, consuming surrounding material.
- The implication is that quasars can be used as indicators of the early universe and the formation of galaxies.
- Therefore, their study helps us understand cosmic evolution.
Explanation
Why this works
This answer is strong as it directly addresses the question about quasar evidence in cosmology. It explains the significance of the energy output of quasars and links it to the understanding of galaxy formation, fulfilling the learning objective effectively.
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