Arizona has been hosting the world’s largest Earth science experiment since 1987, spanning 7.2 million cubic feet

Arizona has been hosting the world’s largest Earth science experiment since 1987 – and at 7.2 million cubic feet, it’s a big one.

This is Biosphere 2, and it’s been designed to replicate Earth’s natural ecosystem in an enclosed environment.

Space Biospheres Ventures built the facility to see if humans could survive in a self-contained habit.

It cost $150 million to create, but how would it fare in the long run?

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The 7.2 million cubic feet Arizona science experiment that didn’t go to plan

In 1991, eight people entered the facility and were sealed in.

They weren’t allowed anything from the outside world – all food and water had to come from inside the biosphere and they couldn’t communicate with outsiders.

Inside their new home was forests, deserts, tons of animals and even a coral reef.

It was a very diversified environment, and things started off promisingly enough.

But when things went bad, they went really bad.

Scientists were forced to pump extra air into the enclosure after oxygen levels dipped to a dangerously low level.

The crew of eight were forced to tighten their belts in other ways, as they began rationing food once supplies ran low.

As a result of low morale, the group broke off into two factions.

Bear in mind, during this period, people could still visit the biosphere and look in through the glass.

Not the most encouraging display if the team are divided and they’re barely feeding themselves.

Strange things can happen to humans in unfamiliar environments – and space is no different.

How did Biosphere 2 end – and what is it like now?

When it came time for them to leave in 1993, they were underweight and a little worse for wear.

The experiment was attempted again in 1994, but yielded similar results.

Halfway through the second run, Space Biosphere Ventures went bust and Columbia University took over the management position in 1995.

This would go to the University of Arizona in 2007, who have kept it open for the public whilst continuing to conduct research there.

The building is still in good shape and the interior is somewhere between resembling a museum and a botanical garden.

Whether or not this experiment can be deemed a failure is up to personal interpretation.

One of the original biosphere residents, Mark Nelson gave his assessment: “Just the fact that the same number of people came out as went in is a triumph.

“I like to say we built it not because we had the answers.

“We built it to find out what we didn’t know.”

That’s the thing about science – you never exactly how things might pan out.

But scientists are always looking to push the boundaries of what’s possible.

That’s why robots could prove revolutionary in disaster relief, and whole neighborhoods are being built using 3D printers.

So whilst Biosphere 2 didn’t reach its full potential the first time around, there’s always hope for the future.