The inside of a spaceship

The BBC has an article by Richard Hollingham about spaceship design:

The starship Enterprise has got to be one of the most beautiful fictional spacecraft ever created. But imagine beaming aboard (and I bet many BBC Future readers have) and living there. At first the pristine corridors, groovy minimalist furniture, view screens, and food replicators would seem impossibly exciting.
However, after a few months, I suspect the sterile interior, with its lack of pictures, plants, and human clutter, would begin to get you down. What starts out resembling a futuristic utopia, soon feels like being trapped in Ikea on a wet Sunday afternoon. What they never show you on television are the long queues for the holodecks to escape from the unrelenting neatness and cleanliness of it all.
While the Federation may be a few years in the future, long duration spaceflight is already a reality. People routinely spend six months in space at a time and, next year, two astronauts are set for a year-long mission to the International Space Station (ISS). When they get there, they will find the interior decor also leaves a lot to be desired, packed as it is with consoles, wires, ducts and equipment.
“The inside of the ISS (photo) is incredibly sterile,” says Rachel Armstrong, newly-appointed professor of experimental architecture at Newcastle University in northeast England. “It’s like living inside a plastic box.” Armstrong is an advocate of making our habitats beyond the Earth– space stations, craft, colonies, and starships– much more like our existing giant starship, the Earth. “For us to go beyond mere survival and spend any time in space, we have to learn how to thrive beyond our home planet,” says Armstrong, “and that means thinking of our habitats ecologically.”
But this is about much more than having a few potgdc plants around the place, or a few lettuce leaves growing in a sealed incubator. Her point is that, on Earth, we rely on a delicate and balanced ecosystem to support us. This includes the billions of bacteria that line our gut to help us digest food, the plants we eat, and the trees that supply us with oxygen and absorb carbon dioxide; functions that need to be artificially sustained in space. “Other than jumping off the Enterprise to visit a lush planet to pick up some resources, there is no notion of biodiversity or ecology in Star Trek,” says Armstrong. “The idea that we’re going to spend any amount of time in space without any ecological fabric that will promote our survival ix a very challenging concept.”
Ultimately, Armstrong imagines giant floating biomes drifting through the cosmos. Self-sustaining organic spaceships with fields, lakes, and mountains, similar to ones I’ve written about before in this column. However, so far any attempts to create large-scale successful closed biological systems on Earth have failed.
To cut a long, and somewhat depressing story, short the most ambitious– the Biosphere 2 project, a giant greenhouse complex in the Arizona desert– ended when oxygen levels dropped, pest species such as cockroaches proliferated, and the “crew” fell out with each other. This is why Armstrong differs from many starship dreamers in her desire to start small, to see these ideas implemented in stages.
Take one of the most complex systems on the ISS, for instance: the toilet and urine processing system. This quarter-billion dollar device makes boldly going a costly undertaking, using a technologically advanced filtration system to recycle human waste into drinking water.
The same process happens on Earth for a lot less money. When we drink tap water– particularly in urban areas– there is a good chance it has already passed through several other people before us. Most of the “cleaning” of that water has been carried out by bacteria or plants in the natural environment– such as a river– or by cultures of bacteria in sewage treatment plants. Armstrong advocates a similar adoption of biological systems in space. “If we start to think about the processes that take place in a spaceship interior, then we can start to design differently,” she says. “It could be a colony of bacteria, a bit like we have in a sewage farm, fitted to the ISS to convert waste into useable products.” These would have the additional benefit of making the space station a more attractive place to live. “We can imagine these being bubbling, flowing, tubes or tanks that are situated around the wall spaces,” says Armstrong. “Already this is starting to be a visually interesting environment; creating an aesthetic experience that makes us feel good.”
Water is also an excellent radiation shield and, as an added benefit, these bubbling tubes could be used to protect astronauts from dangerous cosmic rays or solar storms. Armstrong also envisages growing tanks of algae, fed with sewage and sunlight, that could be harvested for food.
Even if they never get fitted to a space station, these are concepts that potential Mars or Moon colonists will need to think about. If humans have any chance of sustaining civilization beyond a generation on another world, without constant supplies from Earth, then they will need to develop organic systems that work in extraterrestrial environments. “By working together with life and machines,” says Armstrong, “we’ll get much better insight into the systems we need to establish for us to live beyond Earth.”
So when, in 2151, the real starship Enterprise sets out on its maiden voyage, its interior may look very different to how we imagine it today. Instead of featureless corridors, they might be lined with bubbling tubes of algae. There will be grass, instead of carpet, on the floor and trees will grow on the bridge. Just watch for falling branches when the Klingons attack...

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