I would like to see us build a space station that is in solar orbit with 3d printing technology on board. Transports from Mars and Earth and maybe even small asteroids could be attached to it and used as material for the 3d printers to make new pieces (and ever more advanced 3d printers) to keep building until the space station could have enough bio domes to support human life and someday, after many decades or even centuries of adding to it, have a bit of gravity of its own but still able to navigate through space if need arises.
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