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 a method to estimate the rate of expansion of the Universe and supports the Big Bang theory.
Explanation
Why this works
This answer is strong as it not only states Hubble's law but also explains its implications for understanding the Universe's expansion. It tests the student's recall of key concepts and their ability to articulate the importance of these concepts in cosmology.
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