r/scifi
Science Fiction, or Speculative Fiction if you prefer. Fantasy too. Asimov, Bradbury, Clarke, Dick, Heinlein and other SF books. SF movies and TV shows. Fantasy stuff like Tolkien and Game of Thrones. Laser guns, space ships, and time travel. etc. Star Trek, Battlestar, Star Wars, etc.
You can now watch Dune on Netflix!
I'm adding English subtitles to Tillbaka till Vintergatan (Back to the Milky Way), an amazing Swedish sci-fi show