Exam-style question
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What does a velocity-distance graph indicate about the movement of galaxies?.
- A.Galaxies are moving closer together
- B.Galaxies are moving away from each other
- C.Galaxies are stationary
- D.Galaxies are moving in random directions
Model answer
What a good answer should say
- Galaxies are moving away from each other
Explanation
Why this works
The evidence from a velocity-distance graph shows that as the distance of galaxies increases, their velocity also increases, indicating they are receding from us. This implies that the universe is expanding, leading to the conclusion that galaxies are moving away from each other.
Common mistake
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