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## Main Question or Discussion Point

Hello,

I have read that `cosmological redshift` means a photon is being `stretched`by space dilation and thus gets to have `longer wavelength`

I am unsure if this is true and if yes, why is it true

Many thanks

I have read that `cosmological redshift` means a photon is being `stretched`by space dilation and thus gets to have `longer wavelength`

I am unsure if this is true and if yes, why is it true

Many thanks