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Q&A What are the minimum set of physical characteristics to define an Earth like planet?

Introduction I have a vague notion of building some sort of strategic space game. Similar to other strategic games, locations are assigned value based upon some abstract evaluation. Following in...

6 answers  ·  posted 9y ago by Jim2B‭  ·  last activity 9y ago by Jim2B‭

Question space biology natural-resources terraforming colonization space-colonization