On Friday, December 8, 2017 at 3:04:42 PM UTC, [email protected] wrote:
>
> How is it distinguished from red and possibly blue shifting due to 
> relative motion of distant galaxies? TIA, AG
>

I meant to ask how one distinguishes the Doppler shift (red or blue) from 
the Cosmological shift (red) for distant galaxies. TIA, AG 

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