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How would things look if we saw them through the light of a blue or red star? Would there be any changes?

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I guess it would be influenced. Right now, our vision is already influenced by that massive blue sky above us. The human visual system corresponds to the large influx of blue light that gets scattered in the atmosphere. Having a red or a blue star would probably also have some influence, as would have a different kind of atmosphere (which is not mainly nitrogen and oxygen). The brain would probably compensate, but the rods in the eye would have a different composition.

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