Exam-style question
Try this first
Which of the following best describes the relationship between redshift and the expansion of the universe?.
- A.Redshift is unrelated to the universe's expansion
- B.Redshift indicates galaxies are moving closer together
- C.Redshift provides evidence for an expanding universe
- D.Redshift only applies to nearby stars
Model answer
What a good answer should say
- Redshift provides evidence for an expanding universe
Explanation
Why this works
Redshift is a key observation that supports the theory of an expanding universe, as it shows that galaxies are moving away from us, consistent with Hubble's law.
Common mistake
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