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Q&A How Would An Advanced Race Capable of Colonization Classify Planets

I've had a look around the internet and the only real classification system for planets seems to be the one from Star Trek, which I don't want to use. The real groups that planets fall under seem t...

3 answers  ·  posted 7y ago by Douglas‭  ·  last activity 7y ago by Douglas‭

Question space planets civilization colonization space-colonization