When humans take up residence on Mars, it might be in a structure similar to Biosphere II, a $30-million project being built outside Tucson. Carl Hodges, director of the Environmental Research Laboratory at the University of Arizona, which is developing the self-sustaining, closed environment, will give a free lecture at 7:30 tonight at the Reuben H. Fleet Space Theater and Science Center. The talk is part of the theater's National Space Week celebration.

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