(8 April 2017) I was watching a PBS special called “Space Time – The First Humans on Mars” [1] and found that in the discussion they talked about building a city that essentially would be an over-sized Gravitron [2].  In the video the city would be built on a band that rotates around in a circle like an artificial gravity style space station but at less of an angle to ground, like a Gravitron, just much bigger.  It seems at least some one has thought this idea through, as you could use this as the basis for building a 1 ‘G’ city or colony on all most anybody in the solar system including the Moon and Mars.
Now imagine though, I want to build a smaller version.  I need a huge 3D printer to make the tubes for say a Hyperloop system that is just a touch ‘bigger’ then normal and …
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