What colour would the sky be under a red star?

What effect would having a red star have on the colour of the sky, and the colour of ambient light?



Assuming that it was a planet much like earth, with the same atmospheric make up, gravity, density etc.What colour would the sky be under a red star?I would say red. Because a red star doesn't give off blue light.

For example in a photographer's red room you would be hard pressed to see the room lit up with blue light.What colour would the sky be under a red star?
bluuuuuuuuuueWhat colour would the sky be under a red star?pale purpleWhat colour would the sky be under a red star?
A lot darker, but assuming it's still a Nitrogen/Oxygen atmosphere, it would be blue.What colour would the sky be under a red star?Look like The American Flag.



Real patriotic.



I wouldn't mind colonizing a planet like that.
My understanding would be that it would still be blue. Our atmosphere reflects most of the color but allows for the blue wavelengths to pass through.



The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air.



However, much of the shorter wavelength light is absorbed by the gas molecules. The absorbed blue light is then radiated in different directions. It gets scattered all around the sky. Whichever direction you look, some of this scattered blue light reaches you. Since you see the blue light from everywhere overhead, the sky looks blue.



Regardless if it was a red dwarf, brown dwarf or a Protostar, as long as out chemical makeup remains the same, the sky would be blue.What colour would the sky be under a red star?
Tim said, "...My understanding would be that it would still be blue..."



Can't be blue if there isn't any significant amount of blue light to be scattered. I say, on a clear cold day, it would look black... with visible stars. On less-clear days, I suppose we would see a reddish glow in the sky, and of course on an overcast day, the clouds would all look red....



...That is, to our human eyes. A being who evolved on that world might have a very different perception of colors. (might, have monochromatic vision, and no concept of color at all.)
The reason the sky is blue is Rayleigh scattering. The scattering cross-section for photons varies inversely as the fourth power of the wavelength of light. What that means, is that the bluest light that comes from the star is scattered the most. You didn't specify how red the star is, but there are essentially no stars that are so red that they emit no yellow light. If the star is sufficiently red that it has no significant blue light, then the next longest wavelength (green or yellow) will be scattered the most and the sky will appear that color. So, I'd say that the sky would appear more greenish than the Earth's sky does today, and it would also be less bright (since less of the total light would be scattered). Stars would be easier to see in the daytime.What colour would the sky be under a red star?
Purple. or shade of purple

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