Exam-style question
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What does a velocity-distance graph indicate about the movement of galaxies in the universe?.
Model answer
What a good answer should say
- A velocity-distance graph shows that galaxies are moving away from us, with their velocity increasing with distance.
- This indicates that the universe is expanding.
Explanation
Why this works
The evidence from the graph shows a positive correlation between velocity and distance, suggesting that more distant galaxies recede faster. This supports the theory of an expanding universe, leading to the conclusion that the universe is not static but dynamic.
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