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When I conceptualized my space biotop in 2013, my original motivation was to suggest a reasonable alternative to non-realistic ambitions to send human travellers to the planet mars. Since the extremely cold desert awaiting us there would be unable to sustain our lives in any respect, we would need an artificial environment anyhow. Why not create one in empty space? This appeared to me much easier to accomplish than to be stuck by gravity on an inhospitable wasteland.
But we could reduce complexity and risk by one more step. Why should risk anyone his / her life and dive into an extremely insecure adventure? Before sending any biotop on a years-long journey, of course we first would test it in a simple orbit around earth. Human presence in such an undertaking would mean no greater risk than travelling on the actual ISS. But in contrast to the ISS consuming huge ressources every year, the aspiration of the biotop would be autarky,
The station would be constructed in space from modules as described, harbouring a community of organisms in equilibrium with each other. All functions of this ecosystem would be regulated from outside. There would be no need for a human presence. Experiments could continue by increasing slowly the size of the orbit. Step by step the biotop might finally reach out even to the planet mars, why not?
We wouldn't have to stop there. We could install several of such bio-colonies on orbits around earth or around the sun. I imagine biotops chasing each other on the same Hohmann orbit, with occasional rendevous with earth and mars. Without investment of much energy, the distance between these stations could be changed by transiently increasing or decreasing the diameter of the orbits, with faster speed on lower and slower speed on higher orbits.
Durability of the constituting materials and perfect recycling of all constituents provided, a considerable amount of biomass could be accumulated on near earth orbits, still without any human passengers. A wide spectrum of communities would be tested on these stations, consisting of hundreds of different species. The complexity of their interaction is beyond our actual imagination. Most of these testruns would fail, but some of them would thrive and flourish.
It will take decades if not centuries of research until we would dare to allow for human beings in these space-dwelling communities. Again, we would start on stations with low earth orbits. In a few centuries, thousands of people might live securely for a few years on such space biotops. By switching between biotops on slightly different orbits during occasional encounters it might be possible to avoid extremely long journeys due to rare Hohmann encounters with earth.
Instead of risking human lives, virtual visitors may visit the station at any time. They will roam to all districts by the aid of flying robots. The continuous recording of vital parameters of all plant, animal and microbial passengers will not need any (costly) human presence. A first aim, data collection and simple entertainment, can be reached without any human lives on stake. Nevertheless, we also should have a second aim in mind: preparing a secure harbor for several human generations in case of catastrophic events making earth an inhospitable place.
MB 7/20
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