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Why was the small balloon in the cosmological redshift picture red?

April 26, 2017balloon cosmological picture red redshift small

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Why was the small balloon in the cosmological redshift picture red?

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Hmm, I think no particular reason… actually it’s paler in the textbook version, Fig. 20.22. Possibly the authors are trying to convey that light gets redder and redder as the universe expands (in which case, the small balloon shouldn’t be so red).