Stuff found rummaging about the Orion’s Arm site, including its History and inspiration sources, as well as some other hard-SF space-opera worldbuilding projects, some of which were used as source material and directly incorporated into Orion’s Arm: The ArcBuilders universe, the Ad Astra RPG setting and the Hamilton Institute of Exopaleontology. Most of these are more conventional Space Opera in tone (i.e., less Godlike AIs).
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