Exam-style question
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How does the redshift observed in distant galaxies relate to the velocity-distance graph?.
- A.It indicates they are moving towards us
- B.It indicates they are moving away from us
- C.It has no relation to their distance
- D.It shows they are stationary
Model answer
What a good answer should say
- It indicates they are moving away from us
Explanation
Why this works
The evidence of redshift in distant galaxies shows that their light is shifted towards longer wavelengths, which indicates they are moving away from us. This interpretation supports the data represented in the velocity-distance graph, where increased distance correlates with increased velocity.
The implication is that this redshift is a key indicator of the universe's expansion, leading to the conclusion that the universe is continuously expanding.
Common mistake
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