BTW, io9 has an interesting comparison between the film and the novel. Sounds like the book (unsurprisingly) fleshes out some scenes and explains some of the weird things going on in the film. Also, in the book, Starkiller base is supposed to use dark matter as the main weapon, not the matter taken from a star.
Edit: Forgot the link.
http://io9.gizmodo.com/the-11-bigges...e-v-1749329046