Biosphere 2 is an Earth systems science research facility owned by the University of Arizona. Its current 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 (12,700 m2)structure originally built to be an artificial, materially closed ecological system in Oracle, Arizona (US) by Space Biosphere Ventures, a joint venture whose principal officers were John P. Allen, inventor and Executive Director, and Margret Augustine, CEO. Constructed between 1987 and 1991, it was used to explore the complex web of interactions within life systems in a structure that included five areas based on biomes and an agricultural area and human living/working space to study the interactions between humans, farming and technology with the rest of nature. It also explored the possible use of closed biospheres inspace colonization, and allowed the study and manipulation of a biosphere without harming Earth's. The name comes from Earth's biosphere, Biosphere 1. Earth's life system is the only biosphere currently known.