Exam-style question
Try this first
Which of the following best describes the relationship between redshift and the expansion of the universe?.
- A.Redshift indicates that the universe is contracting
- B.Redshift is unrelated to the universe's expansion
- C.Redshift supports the theory of an expanding universe
- D.Redshift only occurs in nearby galaxies
Model answer
What a good answer should say
- Redshift supports the theory of an expanding universe
Explanation
Why this works
The evidence of redshift from distant galaxies shows that their light is shifted towards longer wavelengths, indicating they are moving away. This interpretation supports the implication that the universe is expanding, leading to the conclusion that redshift is a key piece of evidence for this theory.
Common mistake
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