Exam-style question
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How can the concept of redshift be used to infer the recession of galaxies in the universe?.
Model answer
What a good answer should say
- Redshift can be used to infer that galaxies are receding from us, as the light they emit is shifted towards longer wavelengths.
Explanation
Why this works
The evidence of redshift indicates that the light from galaxies is stretched, which is interpreted as a sign of their movement away from Earth. This implies that the greater the redshift, the faster the galaxy is receding, supporting the idea of an expanding universe.
Thus, the conclusion is that redshift serves as a key indicator of the recession of galaxies.
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