The Best Sci-Fi Books (According to Empire)

From the Empire article by William Lobley: "Sci-fi literature is an epic genre in every sense. Not only are the tales themselves heroic feats of imagination and storytelling, but the vast quantity and quality of the titles available in the genre is mind-boggling. Sci-fi books cover a wide array of subject matters and themes, exploring the far reaches of pretty much everything, from space, time and even the human mind ...
Whether you're looking to step into reading the genre for the first time, or you're a veteran looking for a title that may have passed you by, here are the sci-fi books you can't go without."