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I guess (stress the word guess) it has something to do with the composition of those galaxies and the phenomenon of refraction. Every chemical element refracts a certain colour in the rainbow spectrum (that is why our sky is blue, for instance, I can't remember which gas in our atmosphere - nytrogen or oxygen - blocks all the other colours and lets only blue pass through).

The distance between those galaxies and Earth may also play a key role.

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15y ago

What else can I help you with?