Interstellar travel, or travel between star( system)s, require BTC travel, preferably FTL travel, though slower than light interstellar colonization is possible by hollow asteroid/comet colonies or artificial hibernation.
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Interstellar travel, or travel between star( system)s, require BTC travel, preferably FTL travel, though slower than light interstellar colonization is possible by hollow asteroid/comet colonies or artificial hibernation.