By "spacefaring" I mean the ability to live in/utilize space (asteroid mines, fast travel like lightspeed, harnessing greater energy sources, terraforming planets, etc.)
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We already have the technology to set up small enclosures that could theoretically support a small number of people in an environment like Mars or the Moon for an indefinite period of time. The problem is that nobody is willing to fund it, and nobody is willing to work with anyone else to make it happen.