Exam-style question
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What role do quasars play in understanding the universe's expansion?.
- A.They provide evidence for a static universe.
- B.They help measure distances to faraway galaxies.
- C.They indicate the presence of dark matter.
- D.They are irrelevant to cosmological studies.
Model answer
What a good answer should say
- They help measure distances to faraway galaxies.
Explanation
Why this works
Quasars, due to their extreme brightness, can be observed at great distances. Their redshift provides information about the rate of expansion of the universe, allowing astronomers to measure distances to faraway galaxies and understand the dynamics of cosmic expansion.
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