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Reflecting the dim light of its parent red dwarf star, the bright water clouds of Gliese 876 c appear yellowish. Dim yellow glow of a red dwarf star.

In Celestia, the color of planets orbiting M stars is reddish. Chris should change the glow and the reflected color of planets of M stars to a more yellowish color. I saw somewhere about this. Should M stars color be changed or not?

You can switch the star colours by pressing % - this toggles between "classic" and "blackbody" star tables.

From several discussions a while back on this board, it would seem that the tinted illumination is rather unrealistic however - the eye can compensate for the colour of the star well enough to give the illusion of white light at planetary distances from most stars. Only in a multiple system would the colour become noticeable, and modelling this could prove difficult.