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You need methane, ammonia and atmospheric temperatures of $∼$150 K. The color of a giant planet depends on the type of clouds dominating its upper atmosphere. These in turn depend on the tempera...
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#1: Attribution notice removed
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2020-06-01T14:13:59Z (over 4 years ago)
Source: https://worldbuilding.stackexchange.com/a/164777 License name: CC BY-SA 4.0 License URL: https://creativecommons.org/licenses/by-sa/4.0/