Favourite sci-fi novels

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Across
  1. 3. / The surname of Vonnegut’s Billy in Slaughterhouse-Five (7)
  2. 5. / The cinematic trilogy by Frank Herbert (4)
  3. 6. / Author of War of the Worlds and The Time Machine (7)
Down
  1. 1. / A novel by Dan Simmons which shares its name with a Keats’ poem (8)
  2. 2. / What Daniel Keyes recommends for Algernon? (7)
  3. 4. / American author of Brave New World (6)