Exam-style question
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What is the significance of Hubble's law in cosmology?.
- A.It describes the motion of planets
- B.It relates the distance of galaxies to their recessional velocity
- C.It explains the formation of stars
- D.It measures the temperature of cosmic background radiation
Model answer
What a good answer should say
- It relates the distance of galaxies to their recessional velocity
Explanation
Why this works
Hubble's law states that the recessional velocity of a galaxy is directly proportional to its distance from us, providing crucial evidence for the expanding universe model.
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