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How much oxygen was in Biosphere 2’s atmosphere at the start of the first mission?
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Biosphere 2
Biosphere 2, located in Oracle, Arizona, U.S., shown in 2008. The facility was originally developed to study survivability and assess whether humans were capable of building and living in self-sustaining colonies in outer space. It was later used as a scientific research facility.
At the start of the first mission in Biosphere 2, the indoor atmosphere consisted of approximately 20.9 percent oxygen.1