The Biosphere Project was built between 1987 and 1991 and sits on approximately 3 acres.
The size of the closed structure is about 2.5 football fields.
The name of this Project is actually Biosphere 2. Biosphere 2 is the largest sealed structure in the world.
What is Biosphere 1? Biosphere 1 is Earth and the term represents Earth's life system and it is the only biosphere that we know of.
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