Exam-style question
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Which of the following best describes the significance of Doppler redshift in cosmology?.
- A.It helps determine the temperature of celestial bodies.
- B.It provides evidence for the expansion of the universe.
- C.It measures the distance to nearby stars.
- D.It indicates the composition of distant galaxies.
Model answer
What a good answer should say
- It provides evidence for the expansion of the universe.
Explanation
Why this works
Doppler redshift is significant in cosmology as it provides evidence for the expansion of the universe. The observation of redshift in light from distant galaxies indicates that they are moving away from us, supporting the theory that the universe is expanding.
This is distinct from other measurements that may indicate temperature or composition, which do not directly relate to the motion of celestial bodies.
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