You're probably aware that most sci-fi space battles aren't realistic. The original Star Wars' Death Star scene was based on a World War II movie, for example. But have you wondered what it would really be like to duke it out in the void? PBS is more than happy to explain in its latest It's Okay To Be Smart video. -break- ...even close-up combat might not happen. Given the sheer distances and the limits of the speed of light, it might look more like classic naval warfare...