| http://www.w3.org/ns/prov#value | - Because space is a very, very expensive proposition.For a species to be interplanetary (in their solar system) colonizers they have to have all but abolished war on their own planet and have to have working international economies and shared interests.For a species to be interstellar colonizers they need to have only one government and be at the point in their development that they no longer make
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