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USA_SCI_BIOSPH_78_xs <br />
The Biosphere 2 Project’s twenty-seven foot test module seen with star trails at night in a long exposure. The building to the right is an atmospheric chamber used to equalize the air pressure in the module. The Biosphere was a privately funded experiment, designed to investigate the way in which humans interact with a small self-sufficient ecological environment, and to look at the possibility of future planetary colonization. The $30 million Biosphere covers 2.5 acres near Tucson Arizona, and is entirely self-contained. The eight ‘Biospherian’s’ shared their air- and water- tight world with 3,800 species of plant and animal life over their two-year stay in the building, producing all of their own food and supporting the whole environment in five 'biomes'; agricultural, rain forest, savannah, ocean and marsh.  1986