Biosphere 2 is an American Earth system science research facility located in Oracle, Arizona. It was originally constructed between 1987 and 1991, and has been owned by the University of Arizona since 2011. 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.[1] It is a 3.14-acre (1.27-hectare)[2] structure originally built to be an artificial, materially closed ecological system, or vivarium. It remains the largest closed system ever created.[3]
