Biosphere 2 is a 3.14-acre research facility in Arizona that houses miniaturized versions of various ecosystems, including a tropical rainforest, an ocean, and a savanna grassland. The world’s largest closed ecological system was initially designed to determine if life could survive in an artificial habitat modeled after Earth—Biosphere 1—as a predecessor to space colonization.
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The vivarium—an enclosed system including animals and plants—is sealed from below with 454 metric tons of stainless steel liner and includes an ocean habitat with more than 700,000 gallons of seawater. B2 is visited by 100,000 people yearly, including more than 10,000 K-12 students.
Although confined from much of the surrounding environment, B2 allows sunlight to enter, enabling its plants to engage in photosynthesis. Expansion chambers were built to protect the facility's integrity by managing changes in gas pressure resulting from temperature fluctuations.
Twenty-six underground air handlers heat, cool, filter and manage the humidity of the air across the biomes of Biosphere 2. The above-ground Energy Center complex provides continuous power to these and other systems, including heating and cooling water for laboratory experiments and personal use.
The Landscape Evolution Observatory at Biosphere 2 examines how factors such as climate change, water flow, weathering and community development impact landscape structures comprising 500 metric tons of crushed rock. Research is also conducted at biomes representing savannas, mangroves, coastal fog deserts, oceans and rainforests.
The videos provide a 360-degree view of the indoor rainforest, ocean ecosystem, Landscape Evolution Observatory, and underground technosphere. A Google Maps Street View option is available to explore additional biomes, with each associated with a different floor level on the bottom right.
The first crew of “Biospherians” spent four months growing their own wheat and awaiting the ripening of tomatoes, onions, and peppers to make their own pizza. They also raised their own livestock, including chickens, pigs, and two goats named Milky Way and Stardust.
Food and oxygen shortages drove the “Biospherians” to split into two factions—one seeking to bring in outside resources and another aiming to maintain isolation for the experiment’s integrity. Psychological stress was exacerbated further by the increasing prevalence of insect pests.
Instead of being absorbed by plants through photosynthesis to produce oxygen, significant amounts of carbon dioxide were taken up by the calcium hydroxide in the concrete, trapping the oxygen in calcium carbonate and water. This concrete was sealed before the start of the second B2 mission.
Some argue that isolation from the outside world was compromised—making the experiment a failure—when a crew member was taken from Biosphere 2 for surgery and returned hours later. This position was strengthened when it was revealed that oxygen had been pumped into the facility.
Trees appeared to become weak and more prone to breaking because a lack of wind caused them to no longer need to develop stress wood. The extinction of pollinators—potentially due to an explosion in the population of longhorn crazy ants—was also unexpected.
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