Exam-style question
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Explain how redshift provides evidence for the expansion of the Universe.
Model answer
What a good answer should say
- Redshift occurs when light from distant galaxies is shifted towards longer wavelengths, indicating they are moving away from us.
- This observation supports the idea that the Universe is expanding, as it suggests that galaxies are receding from each other.
Explanation
Why this works
This answer effectively connects the concept of redshift to the expansion of the Universe, demonstrating an understanding of how astronomical observations support cosmological theories. It tests the student's ability to explain a key concept in cosmology.
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