Exam-style question
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Explain how high redshift supports the idea that the Universe is expanding.
Model answer
What a good answer should say
- The cause of high redshift is the increasing distance between galaxies due to the expansion of the Universe.
- As galaxies move away, the light they emit is stretched, resulting in a redshift.
- This effect indicates that the Universe is expanding, leading to the conclusion that galaxies are receding from each other over time.
Explanation
Why this works
This answer effectively follows the cause-effect reasoning pattern by identifying the cause (high redshift), explaining the mechanism (light stretching), stating the effect (indication of expansion), and concluding with the consequence (galaxies receding). It tests the student's ability to articulate the relationship between redshift and cosmic expansion.
Common mistake
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