This is a list of books added on the Goodreads science fiction bookshelf 255 to 260 times . I love the bookshelves on Goodreads, and I've added many books to this genre shelf myself, including Who Goes There (the movie that The Thing was based on) on this list.
You may be surprised to see so few shelved Harry Potter on the list, but that's because most people consider the series to be more fantasy than sci-fi.
Solus-Mandalorian-one