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For questions about the gases which surround a planet or some other celestial body.

3 votes

What would make a sky appear purple during the day?

Constant volcanic activity, fires, or oceans full of algae that reflect red light combined with a bright sun and a thick atmosphere could cause a violet-shade sky. … Here's an idea: If you had a high amount of neon in the atmosphere and constant storms, the sky would appear blue and purple as neon plasma is reddish in hue. …
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