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If there is a floating biome high up in the atmosphere that might produce a lot of oxygen and if there were limited numbers or no species of animals that oxygen might build up. At first anything that could be oxidized on the surface would be but eventually there would be little left to burn and high pressure oxygen would accumulate. Any falling matter ...


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I would suggest that the result would be something like Venus. You might start with a planet with 1atm Earth like atmosphere at 50km altitude and a similar composition down to the surface but that would not be stable. A much deeper atmosphere would absorb more heat and at such a high pressure and oxygen concentration, organic material on the surface would ...


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No sunburn risk. It's very dark at 50km. https://en.wikipedia.org/wiki/Atmosphere_of_Venus#Upper_atmosphere_and_ionosphere this article tells us the opaque clouds extend up to 60km. In addition: https://wattsupwiththat.com/2019/10/03/svensmark-on-venus-mystery-of-the-unknown-uv-absorber-solved/ The atmosphere of Venus absorbs UVs. In addition, if ...


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Figure 4 in this paper would lead one to believe that the SO2 in the upper Venusian atmosphere does a poorer job of blocking the higher energy UV rays than Ozone on a per molecule basis. It's hard to say exactly how much SO2 there is compared to earth's Ozone layer though. But there is a thin ozone layer at Venus, and at 50 km, you're below the upper cloud ...


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