Photon Decoupling: Effects on Universe Expansion

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Adhruth Ganesh
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Why did the expansion of the universe cause an increase in the wavelength of the photons that existed during the time of Photon decoupling ?
Does this mean that expansion of universe stretches everything and stars that were present when the universe considerably expanded also got stretched?
 
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Orodruin said:
Gravitationally (or otherwise) bound systems do not expand.
Fine. Thanks.
 

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