The title of Spaceship Earth refers to Biosphere 2, an enclosed location in the Arizona desert that replicates Earth's ecosystem. This domain has been created in an attempt to create a sustainable environment that could be used on other planets. You could just build another biosphere on Mars and, presto! You've got a location where astronauts can live without any problem! A group of people are placed inside Biosphere 2 to see if it's possible for human beings to survive just in here, with no contact with the outside world, for two years. If they succeed, both the participants of this project and its backers believe they will have made a scientific breakthrough.
