Books shelved as adult-sci-fi: The Martian by Andy Weir, Ready Player One by Ernest Cline, The Hitchhiker's Guide to the Galaxy by Douglas Adams, Sleepin.
Books shelved as adult-sci-fi-fantasy: The Night Circus by Erin Morgenstern, The Hobbit or There and Back Again by J.R.R. Tolkien, The Martian by Andy We.
What are the top sci-fi books, including the best sci-fi series? This post offers a list of highest-rated, must-read science fiction books on.