Exam-style question
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What does a redshift in the light from distant galaxies indicate?.
- A.The galaxies are moving towards us
- B.The galaxies are moving away from us
- C.The galaxies are stationary
- D.The galaxies are increasing in brightness
Model answer
What a good answer should say
- The galaxies are moving away from us
Explanation
Why this works
The evidence of redshift shows that the wavelengths of light from distant galaxies are stretched, indicating they are receding from us. This implies that the universe is expanding, leading to the conclusion that distant galaxies are moving away from us.
Common mistake
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