Exam-style question
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How does the redshift of a quasar provide evidence for the expanding universe?.
Model answer
What a good answer should say
- The redshift of a quasar indicates that it is moving away from us, which suggests that the universe is expanding.
- This is consistent with Hubble's law, which states that the recessional velocity of galaxies is proportional to their distance from us.
Explanation
Why this works
This answer connects the concept of redshift to the broader understanding of the expanding universe, demonstrating the application of theoretical knowledge to observational data. It tests the student's ability to explain the significance of redshift in cosmological terms.
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