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My take on it is the opposite view it seems life on other planets living in liquid water would develop vision to see in the middle of the colour spectrum since
by dghughes 12y ago
My take on it is the opposite view it seems life on other planets living in liquid water would develop vision to see in the middle of the colour spectrum since it passes through water the best, the same as on earth. Life would need to have eyes adapted to the same frequency due to the properties of liquid water.
If an alien planet with liquid water had a different class of star the light from it may not emit the same amount of the frequency of light to make through water compared to earth but to the life on that planet it would be normal.
I think water is the key not so much the sun since life would need liquid water to exist and the light needed whether abundant or not could only be in the frequency alien eyes could use the best which would be the same as life on earth.
The biggest factor in life being different on an alien plant I think would be due to gravity and atmosphere; pressure and oxygen level.