Biosphere 2 is an American Earth system science research facility located in Oracle, Arizona. It 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. It is a 3.14-acre (1.27-hectare)[1] structure originally built to be an artificial, materially closed ecological system, or vivarium. It remains the largest closed system ever created.[2]

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