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How was Biosphere 2 intended to test whether people could live in space colonies?
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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.
Biosphere 2 was designed as a sealed, self-contained environment to determine if humans could successfully live in self-sustaining colonies in outer space.
To test this, the facility emulated Earth’s environment through several key features:
- Closed Ecosystems: The structure housed five distinct biomes—including a tropical rainforest, desert, and ocean—to study how biological systems interact within a confined space.
- Agricultural Self-Sufficiency: Crews were expected to produce their own food, including grains, vegetables, and animal products, while managing waste through biological recycling systems like soil-bed reactors and algal scrubbers.
- Technological Life Support: The "Technosphere" and variable-expansion chambers (the "lungs") were engineered to regulate air pressure, temperature, and humidity, simulating the life-support systems required for extraterrestrial habitation.
During missions, researchers monitored atmospheric conditions and agricultural output to assess the feasibility of long-term human survival in isolation. However, challenges such as fluctuating oxygen levels and food production difficulties highlighted the immense complexity of creating a truly self-sustaining colony.1