Exam-style question
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State Hubble's law and explain its significance in cosmology.
Model answer
What a good answer should say
- Hubble's law states that the velocity of a galaxy (v) is directly proportional to its distance (d) from us, expressed as v = H₀ × d, where H₀ is the Hubble constant.
- This law is significant because it provides evidence for the expansion of the Universe, indicating that galaxies are moving away from us and that the Universe is growing larger over time.
Explanation
Why this works
This answer effectively captures the essence of Hubble's law and its implications for cosmology, testing the student's understanding of the relationship between distance and velocity in the context of an expanding Universe.
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