Exam-style question
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How does Hubble's law relate the velocity of a galaxy to its distance from Earth?.
- A.Velocity is constant regardless of distance
- B.Velocity increases as distance decreases
- C.Velocity is directly proportional to distance
- D.Velocity is inversely proportional to distance
Model answer
What a good answer should say
- Velocity is directly proportional to distance
Explanation
Why this works
Hubble's law states that the velocity of a galaxy is directly proportional to its distance from Earth, which means that more distant galaxies move away faster, supporting the expanding universe model.
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