Biosphere 2 was built between 1987 and 1991 at a cost of $150 million. Two missions, in 1991 and 1994, saw crew members sealed inside the glass enclosure to…
With 10% air volume annual leak rate, Biosphere 2 was the most tighly sealed structure when it was used as a closed-mission facility. A stainless steel pan…
Habitat entrance.
Closed-water cultivation.
One of the two lungs of the structure, used to regulate air pressure as temperature varies.
Two missions, in 1991 and 1994, saw crew members sealed inside the glass enclosure to…