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How long did the first Biosphere 2 mission last?
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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.
The first mission of Biosphere 2 lasted for exactly two years. The crew of eight individuals was sealed inside the facility on September 26, 1991, and emerged on September 26, 1993.1