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How many people were sealed inside Biosphere 2 during 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.
During the first mission at Biosphere 2, which began on September 26, 1991, a total of eight people—four men and four women—were sealed inside the facility.1