If my story’s set in Chicago in 2005, I can assume that my readers have some general idea of the time and place and how things were and can fill in the picture from the barest hints. But if my story’s set on 4-Beta Draconis in 3205, my readers have no idea what to expect. The world of the story must be created and explained in the story. This is part of the particular interest and beauty of science fiction and fantasy: writer and reader collaborate in world-making. But it’s a tricky business. If the information is poured out as a lecture, barely concealed by some stupid device—“Oh, Captain, do
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