Did Hubble really see photographic representation of red (as in redshift), or was red just a code name or something? Because I didn't think that color photography was invented until the mid or late Thirties.

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chronosyn

Did Hubble really see photographic representation of red (as in redshift), or was red just a code name or something? Because I didn't think that color photography was invented until the mid or late Thirties.

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