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Biosphere 2, Oracle

4.1
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Science Museum · Museum
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Biosphere 2 is an American Earth system science research facility located in Oracle, Arizona. Its mission is to serve as a center for research, outreach, teaching, and lifelong learning about Earth, its living systems, and its place in the universe. It is a 3.14-acre (1.27-hectare) structure originally built to be an artificial, materially closed ecological system, or vivarium. It remains the largest closed ecological system ever created.
Constructed between 1987 and 1991, Biosphere 2 was originally meant to demonstrate the viability of closed ecological systems to support and maintain human life in outer space as a substitute for Earth's biosphere. It was designed to explore the web of interactions within life systems in a structure with different areas based on various biological biomes. In addition to the several biomes and living quarters for people, there was an agricultural area and work space to study the interactions between humans, farming, technology and the rest of nature as a new kind of laboratory for the study of the global ecology. Its mission was a two-year closure experiment with a crew of eight humans ("biospherians"). Long-term it was seen as a precursor to gain knowledge about the use of closed biospheres in space colonization. As an experimental ecological facility it allowed the study and manipulation of a mini biospheric system without harming Earth's biosphere.

Its seven biome areas were a 1,900-square-meter (20,000 sq ft) rainforest, an 850-square-meter (9,100 sq ft) ocean with a coral reef, a 450-square-meter (4,800 sq ft) mangrove wetlands, a 1,300-square-metre (14,000 sq ft) savannah grassland, a 1,400-square-meter (15,000 sq ft) fog desert, and two anthropogenic biomes: a 2,500-square-meter (27,000 sq ft) agricultural system and a human habitat with living spaces, laboratories and workshops. Below ground was an extensive part of the technical infrastructure. Heating and cooling water circulated through independent piping systems and passive solar input through the glass space frame panels covering most of the facility, and electrical power was supplied into Biosphere 2 from an onsite natural gas energy center.
Biosphere 2 was only used twice for its original intended purposes as a closed-system experiment: once from 1991 to 1993, and the second time from March to September 1994. Both attempts, though heavily publicized, ran into problems including low amounts of food and oxygen, die-offs of many animals and plants included in the experiment (though this was anticipated since the project used a strategy of deliberately "species-packing" anticipating losses as the biomes developed), group dynamic tensions among the resident crew, outside politics, and a power struggle over management and direction of the project. Nevertheless, the closure experiments set world records in closed ecological systems, agricultural production, health improvements with the high nutrient and low caloric diet the crew followed, and insights into the self-organization of complex biomic systems and atmospheric dynamics. The second closure experiment achieved total food sufficiency and did not require injection of oxygen.
In June 1994, during the middle of the second experiment, the managing company, Space Biosphere Ventures, was dissolved, and the facility was left in limbo. Columbia University assumed management of the facility in 1995 and used it to run experiments until 2003. It then appeared to be in danger of being demolished to make way for housing and retail stores, but was taken over for research by the University of Arizona in 2007. The University of Arizona took full ownership of the structure in 2011.
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Biosphere 2 reviews

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TripAdvisor traveler rating 4.0
1,265 reviews
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4.6
TripAdvisor
  • We went here on the spur of the moment on a trip to Tucson. It was really interesting. We downloaded the app to a phone and followed the arrows for a self guided tour with recordings at each stop... 
    We went here on the spur of the moment on a trip to Tucson. It was really interesting. We downloaded the app to a phone and followed the arrows for a self guided tour with recordings at each stop...  more »
  • I have been to the Biosphere 2 twice - once in 1998 and in 2002. This week, my husband and I were staying locally and decided to visit. For him, it was a first time experience. We downloaded the... 
    I have been to the Biosphere 2 twice - once in 1998 and in 2002. This week, my husband and I were staying locally and decided to visit. For him, it was a first time experience. We downloaded the...  more »
Google
  • Our first visit was back in February 2019 just before the pandemic shut everything down. We had an amazing tour guide who took us throughout the entire facility including the underneath part. Our second visit in January 2022 was a little different, we had to download an app to download tour guide videos, and didn't have access to go underneath the facility like our first visit. Regardless, it was a wonderful experience and my mother who joined us on our second visit enjoyed it.
  • What a unique and fascinating site to visit! I would highly recommend it to anyone interested in biology or space exploration. Using a QR code presented at the front desk my group was able to take a video tour of the facility. It was so interesting to see the living quarters and notes of participants in the self sustaining facility Biosphere 2 experiment along with the beauty and design of each of the artificial environments. With a gorgeous view of the mountains, sculptures, beautiful landscaping, and donated minerals and fossilized wood in between each stop in the tour there was never a dull moment.

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