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* ColonizedSolarSystem: It's stated that the Solar System is unique among the others settled by humans in that it's been entirely colonized, a process that started before the invention of the Ramsden drive. In other systems, if someone wants to settle a world, they're more likely to build a colony ship and go settle a habitable planet in another system. For example, French mentions two lifeless planets in Murphy's system, Angus and Maeve, one of which is like Mercury and the other is like Mars. Even before the calamity, no one on Murphy had any interest in colonizing those planets.
