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Originally posted by Armin
Have people forgetten the Viking mission pictures where it clearly shows that the sky is blue..
Originally posted by ArMaP
reply to post by shiman
After a little looking up, this is what I got.
Oxygen is not the most common gas on Earth's atmosphere, that place is occupied by Nitrogen, so if the composition of the atmosphere had an impact on the colour of the sky, that would be because o Nitrogen and not Oxygen.
If you could see a different coloured sky where you live because of CO2 then you would be dead, CO2 on the atmosphere is very low, much less than Argon or water vapour.
What makes the sky look blue is the way light is scattered by the molecules of the gases that make up the atmosphere, and that is because of the size of the molecules when compared to the wave length of the light they scatter.
If there are larger particles on the atmosphere, like dust, they are responsible for absorbing and/or reflecting light, but they do not scatter it. The effect of these larger particles is stronger than that of the scatter by the gas molecules, so a dusty atmosphere gets its colour from the characteristics of the particles while a clear atmosphere gets its colour from the density of the atmosphere.
A thinner atmosphere, like the one on Mars, should look light blue if there are no dust particles in the air, if there are then it looks like the dust particles, mostly that reddish brown.