Can Galactic Empires Exist Without Faster-Than-Light Travel?

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My newest science fiction novel, Lockstep, was recently serialized in Analog magazine. Reactions have been pretty favourable — except that I've managed to offend a small but vocal group of readers. They're outraged that I've written an SF story in which faster than light travel is impossible. » 3/31/14 8:09pm 3/31/14 8:09pm