Physics for IGCSE & O level - The Earth In Space (Section 5 - No. 14)
In the 1920s, Edwin Hubble showed that light from distant galaxies are red shifted. What did this observation suggest?
The galaxies are moving towards us.
The galaxies are expanding.
The galaxies are merging.
The galaxies are receding from us.
Explanation
The red shift increases with the distance of the galaxy.
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