advanced-technology alien-invasion astrophysics book-1 chinese-literature cultural-revolution dystopian-future ethical-dilemmas fiction game-theory general hugo-award liu-cixin newyorktimesbestseller nyt:trade-fiction-paperback=2020-09-27 philosophy political-intrigue remembrance-of-earths-past science-fiction sciencefiction space-exploration three-body-problem virtual-reality worldbuilding