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What would a planet's sky look like with different chemical compositions, such as low nitrogen, high methane etc?
What are the processes, chemicals and particles involved in creating colour in a planet's sky? Could you give some examples of sky colour processes different from what happens on Earth?
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What atmospheric radiative effects, if any, do contrails cause?
First of all, this question is not about the conspiracy theory based chemtrails as in the linked question, from the answers there and from the question Equation for predicting contrail formation I ...
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