<P> 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 ) structure originally built to be an artificial , materially closed ecological system , or vivarium . It remains the largest closed system ever created . </P>
<P> 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 ) structure originally built to be an artificial , materially closed ecological system , or vivarium . It remains the largest closed system ever created . </P>
where did they build the structure used in biosphere 2
where did they build the structure used in biosphere 2
Oracle , Arizona
Oracle , Arizona