Post #5by granthutchison » 23.05.2003, 15:46
A hot blue star decreases the amount of red light available, but doesn't altogether eliminate it. The black-body spectrum in the visible band (a rough first approximation to the energy output at various wavelengths) doesn't change in shape very much at all once you get into stars much hotter than the sun. A lot of blue, a moderate amount of green, but still a fair bit of red. At sunset you'd see a very bright blue sky and perhaps a reddish-purple cast to the sun and the sky around it - because the dimmer red light reaching you directly from the sun would have a pretty large blue component scattered into the light path on its way to your eyes.
So green is very tricky, because it is never a dominant wavelength in the black-body spectrum, and it isn't picked out preferentially by scattering.
Grant
