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In a young planet, oxygen can be produced from water vapor via photodissociation, which occurs along a pathway like
#1: Attribution notice removed
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System
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2020-06-01T14:13:50Z (almost 5 years ago)
Source: https://worldbuilding.stackexchange.com/a/56667 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/