Contrary to intuitive expectations based on sound, what does a higher redshift generally imply about the ambient conditions when the light was emitted?
Answer
The source existed during an earlier, hotter epoch of the universe
Although the light received is stretched, higher redshift indicates light originating from an earlier time in cosmic history when the universe, on average, possessed a higher ambient temperature.
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What Does Redshift Tell Us About Distant Galaxies? - Physics Frontier
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