Biosphere 2, a science research facility in Oracle, Arizona, now owned by the University of Arizona. It is a center for research, outreach, teaching, and lifelong learning about Earth, its living systems, and its place in the universe. Originally built to be an artificial, materially closed ecological system, or vivarium, it remains the largest closed system ever created. Original image from Carol M. Highsmith’s America, Library of Congress collection. Digitally enhanced by rawpixel.

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