Exam-style question
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How does redshift support the theory of an expanding Universe?.
- A.It shows galaxies are moving towards us
- B.It indicates galaxies are moving away from us
- C.It proves galaxies are stationary
- D.It suggests galaxies are colliding
Model answer
What a good answer should say
- It indicates galaxies are moving away from us
Explanation
Why this works
Redshift occurs when light from an object is stretched to longer wavelengths as it moves away, indicating that galaxies are receding from us, which supports the expanding Universe theory.
Common mistake
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