Because that’s what science fiction is meant to do: push the envelope, show what things could be if we continue down the path we’re on, and make you question what’s possible. So many science fiction books go beyond their own genre and cause ripples in adjoining genres like horror, etc. I mean, look at the influences from one of the most science fiction franchises on TV: Star Trek. It set the stage for so many other science fiction franchises, including Star Wars, by pushing boundaries of what was considered acceptable, and went further to inspire others in other arenas, like Nichelle Nichols inspiring other Black women (like Whoopi Goldberg) to become actors and making it easier for women and minorities to join NASA. Mainly by threatening them. Seriously. That’s what science fiction is meant to do, and is therefore often political (even in the “good old days”) and I’ve collected the best 20 science fiction books that I think fit the bill. If you’re looking for more science fiction books, or information on its various genres, you can check out our other list of the most influential science fiction books of all time, this list of genre-bending science fiction, or maybe give some love to the best science fiction books you’ve never heard of.