Exam-style question
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What does redshift indicate about the movement of galaxies?.
- A.They are moving towards us
- B.They are stationary
- C.They are moving away from us
- D.They are orbiting around us
Model answer
What a good answer should say
- They are moving away from us
Explanation
Why this works
Redshift occurs when the wavelength of light from an object is stretched, indicating that the object is moving away from the observer. This supports the idea of an expanding universe as described by Hubble's law.
Common mistake
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