Diaspora is a hard science fiction game published by Evil Hat Productions that strives to give a framework for gaming built on the fate system and science of the real world extrapolated to advanced technological situations- with some artistic license to make the world that they present more diverse and entertaining.
Being a fate system, there is an emphasis on story. But there is more crunch in terms of rules than other systems built on that same rules set. As a framework system, there is not much in the way of setting, just a few ideas to get started.
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