Photon Decoupling: Effects on Universe Expansion

Adhruth Ganesh · Feb 26, 2019

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?

Orodruin · Feb 26, 2019

Gravitationally (or otherwise) bound systems do not expand.

Adhruth Ganesh · Feb 26, 2019

Orodruin said:

Gravitationally (or otherwise) bound systems do not expand.

Fine. Thanks.

Photon Decoupling: Effects on Universe Expansion

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