Exam-style question
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What does a higher redshift value indicate about a galaxy?.
- A.It is closer to Earth
- B.It is moving faster away from Earth
- C.It has a higher temperature
- D.It is older
Model answer
What a good answer should say
- It is moving faster away from Earth
Explanation
Why this works
A higher redshift value indicates that a galaxy is moving away from Earth at a greater speed. This is consistent with the predictions of an expanding universe, where more distant galaxies recede faster.
Common mistake
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