NileGuide Expert Says:
During the fall, Science Saturdays offer visitors hands-on experiences in science.
32540 S Biosphere Rd
Off Ariz. 77 at mile marker 96.5
Tucson, AZ 85623
520 896 6200
In the rolling grasslands of the Santa Catalina Mountain north of Tucson is the Biosphere 2. Essentially a huge greenhouse designed and built in the 1980s to be self-sustaining, the Biosphere is the largest controlled environment ever created. In 1991, eight researchers entered the Biosphere in a two-year experiment to see if the Biosphere's environment could support all of their needs for two years. The experiment had mixed results. Today, the Biosphere 2 is managed by the University of Arizona, which uses it to study climate change. There are daily tours.