Alternate/Parallel Worlds
| Piers Anthony | Isaac Asimov | Harry Turtledove |
Time Travel/Time Warp
| Poul Anderson | Isaac Asimov | H.G. Wells |
Lost Worlds
| Brian Wilson Aldiss | Jules Verne |
Psionic Powers
| Catherine Asaro | Marion Zimmer Bradley | Alan Dean Foster |
| Frank Herbert | Stephen King | Anne McCaffrey |
| Joan D. Vinge |
Space Opera/Galactic Empires
| Poul Anderson | Isaac Asimov | Marion Zimmer Bradley |
| David Brin | Lois McMaster Bujold | Stephen King |
| Anne McCaffrey | Andre Norton | Dan Simmons |
| Margaret Weis |
Alien Beings
| Brian Wilson Aldiss | Isaac Asimov | Greg Bear |
| Arthur C. Clarke | Larry Niven | Frederik Pohl |
| Harry Turtledove | H.G. Wells |
Computers/Automation/Artificial Intelligence
| Poul Anderson | J.R. Dunn |
Virtual Reality
| Ben Bova | Neal Stephenson | Tad Williams |
| Walter Jon Williams |
Robots/Androids/Cyborgs
| Isaac Asimov | Anne McCaffrey | Fred Saberhagen |
| Mary Shelley |
Detectives in Science Fiction
| Douglas Adams | Isaac Asimov | Peter F. Hamilton |
| J.D. Robb | William Shatner | Brian M. Stableford |
Shared Worlds
| Star Trek | Star Wars |
Parody/Comedy
| Douglas Adams | Terry Pratchett | Spider Robinson |